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49.
An "unofficial" (not recognized by dictionaries) slang descriptor for a person/thing/action/object, etc., or a combination of, which is one or more of the following:

a waste of time, abandoned, abject, abominable, abortive, absurd, afraid, aimless, anxious, apprehenaive, arid, arrested, assailable, atomic, awful, baby, babyish, backward, bad, banal, barmy, barren, base, baseless, bastard, beastly, beggarly, behind, beside the question, blah, bland, bogus, bomb, bootless, boyish, brainless, bromidic, bummer, caitiffcapricious, careless, catchpenny, characterless, cheap, checked, cheesy, childish, childlike, clichéd, cloying, coarse, colorless, common, commonplace, confusing, contemptible, cotemptible, controvertible, conventional, cool, corn, cornball, corny, corrupt, counterproductive, cowering, cracked, crap, crappy, craven, crazy, crud, cruddy, daffy, daft, dastardly, dazed, dead, deadpan, deficient, degraded, degrading, dejected, delayed, delusive, dense, dense, deplorable, depraved, despicable, destitute, detestable, devoid, diffident, dim, diminutive, dippy, directionless, dirty, disgraceful, dishonest, dishonorable, dismayed, disposable, disreputable, dizzy, dodo, doltish, dopy, dotterel, down, downtrodden, drab, drifting, drudging, dull, dumb, empty, empty-headed, erratic, evanescent, everyday, evildoer, excessive, exhausted, expendable, expressionless, facetious, failed, failing, faint-hearted, fallacious, false, fanciful, fatuous, fawning, featherbrained, feeble, feebleminded, fickle, flaky, flashy, flat, flighty, flimsy, flip, flippant, fool, fool around, foolish, for grins, forlorn, fortuitous, foul, freaked out, freaky, frightened, frivolous, frothy, fruitless, futile, gagged up, garbage, garish, gay, giddy, girlish, glitzy, goalless, good-for-nothing, goofy, green, gross, groundless, groveling, grungy, gullible, gutless, hackneyed, half-baked, half-witted, hang dog, harebrained, heedless, ho hum, hokey, hokum, hollow, hopeless, humble, humbling, humdrum, humiliating, idiotic, idle, ignoble, ignominious, ignorant, ill-advised, ill-considered, illogical, imbecile, immaterial, immature, immobile, immoral, impassive, implausible, impracticable, impractical, improbable, inadequate, inane, inapplicable, inappreciable, incidental, inconceivable, incongruous, inconsequential, inconsiderable, incredible, indelicate, indiscreet, indiscriminate, ineffective, ineffectual, inept, inessential, inexpressive, infamous, infantile, inferior, inglorious, inscrutable, insensate, insignificant, insincere, insipid, insufficient, interminable, inutile, irksome, irrational nonsensical, irrelevant, irresolute, irresponsible, jejune, jittery, joking, joshing, junky, juvenile, kid stuff, kooky, lacking courage, lame, late, laughable, lemon, lifeless, light, light-minded, lily-livered, little, loathsome, loony, loser, lousy, low, low-born, lowly, lowly, low-ranking, ludicrous, mangy, meager, mean, meaningless, measly, mediocre, menial, mentally incompetent, meretricious, microscopic, mindless, minor, minute, indecisive, miscarried, miscreant, miserable, modest, momentary, monkey, monotonous, moronic, moth-eaten, naive, needless, negligible, nervous, niggling, nihil ad rem, no bargain, no dice, no good, no guts, no place, no-account, nonessential, nonsensical, not at issue, not serious, not to the purpose, nothing, nowhere, nugatory, hopeless, nuts, nutty, objectless, obscure, obtuse, odd, off offensive, old hat, old-fashioned, ordinary, otiose, outcast, paltry, panicky, pathetic, pedestrian, peripheral, petty, piddling, pitiable, pitiful, platitudinous, playful, plebeian, pointless, poker-faced, poor, potty, pre-kindergarten, preposterous, primitive, profitless, proletarian, prosaic, puerile, puny, purposeless, pusillanimous, random, rash, ratty, raunchy, recreant, removable, repetitious, result less, retiring, rinky-dink, rotten, rough, routine, rubbishy, run scared, sappy, scandalous, scanty, scared, scatterbrained, screwy, scrubby, scurvy, second-rate, seemly, senseless, sentimental, servile, severe, shabby, shallow, shameful, shiftless, shoddy, shopworn, shrinking, shtick, shy, silly, simple, simple-minded, skin-deep, sleazy, slight, slimy, slow, sluggish, small, small time, soft, sordid, sorry, sorry lot, spineless, sportive, squalid, square, stale, stale, stark, stereotyped, sterile, stiff, stock, stodgy, stolid, stray, stuffy, stupefied, stupid, submissive, subnormal, superficial, superfluous, tame, tatty, tawdry, tedious, terrible, the subject, the willies, thick, thickheaded, thin, thoughtless, threadbare, timid, timorous, tired, tiresome, tiring, tomfool, tongue-in-cheek, transparent, trashy, trifling, tripe, trite, trivial, trumpery, ugly, unassuming, unavailing, unbelievable, uncommunicative, unconvincing, uncouth, underdeveloped, underfoot, underprivileged, undevelopedundirected, undistinguished, unessential, unexciting, unexpressive, unfit, ungrounded, unguided, unimaginative, unimportant, unintelligent, unmanly, unnecessary, unneeded, unoriginal, unpersuasive, unplanned, unpredictable, unpretentious, unproductive, unprofitable, unreal, unreasonable, unrefined, unrelated, unsatisfactory, unsophisticated, noncommital, unsubstantial, unsuccessful, unthinking, unusable, unvaried, unworthy, uselessvacant, vacuous, vagrant, vaguevain, valueless, vanishing, vapid, vile, plebeian, volatile, vulgar, wackywandering, wanton, waste, watery, wayward, weak, wearisome, well-worn, whimsical, white elephant, wide of the mark, wide of the point, wishful, wishy-washy, witless, worthless, wretched, or yucky.
There are literally a thousand different uses for the slang version of "retarded" - (Quick note:) Usage-wise, it came before and set the precedence of the way we use "gay" in slang today - used correctly, they're practically interchangable.

"That test was really gay!"
"Oh yeah, our chemistry teacher is being retarded."

"Mary, stop being retarded! You're so gay, grow up!"

"I thought it was a simple babysitting job, but I was wrong. Besides all the other stuff, I had to clean up after the retard, which was pretty retarded. To top it off, he set the carpet on fire, which I had to put out with the flame-retardent extinguisher. And after all of that, the parents only paid me $15. Babysitting is gay."
by TBB August 05, 2005
 
8.
1. Something that is messed up
2. An insult
3. Something that's stupid
1. *looks at poster that's falling off wall* That poster's retarded
2. OMG your face is so retarded
3. Homework is so retarded
by Livvyxoxo April 27, 2014
 
9.
A mental condition that greatly decreases one's capacity for absorbing knowledge. Not to be confused with "stupid" which simply refers to one who possesses low mental capacity.
Person 1: That guy is so retarded.

Person 2: No, he's just stupid.
by iPawd November 01, 2012
 
10.
firm, first-rate, fit, fixed, focused, formal, forward, free spirit, fresh, fruitful, full, full of life, gay, genius, gentle, gentlemen, genuine, giddy, giving hope, glorious, good, good, good dice, good sport, good-doer, good-for-something, graceful, great, greatly courageous, grounded in sense, guided, gutsy, happy, hardworking, has a place, has guts, healthy, heightened, hero, heroic, high, high-born, high-ranking, honest, honorable, hope, hopeful, huge, humane, humble, hygienic, imaginative, important, in advance, in front, inclusive, independent, indispensable, individual, intelligent, intelligent, intentional, interesting, jolly, kind, kindly, kindly, ladies, lawful, leader, left in perfection, legitimate, lived, lively, logical, lovable, lovable, loved, macroscopic, magnificent, main, main character, major, manly, many layers, matter-of-fact, mature, meaningful, meriting, merry, mindful, mobile, model citizen, modest, momentous, moral, mosaic, necessary, needed, new, noble, normal, not in vain, not odd, not superficial, objective, on point, on purpose, on the right path, on the spot, on-time, original, outgoing, perceptive, perfect, permanent, persuasive, pertaining to, piquant, planned, plausible, playful, pleasant, plenty, plump mind, pointed, practicable, practical, precious, present, prize, probable, producing, profitable, proficient, prosperous, proud, provident, pure, pure within and without, purposed, purposeful, purposeful, quick, rational, rational, real
Russel is retarded.
by Gossamer Willowfly July 10, 2011
 
11.
The word retarded in slang means to get stupid; just act how you want to; dance like you don't know what you're doing. One normally becomes "retarded" after popping an ecstasy pill or doing some sort of drug.
Remember though....ThIzZ iZ wHaT iT iZ
Get stupid, go dumb, act retarded.
by Hyphy101 December 04, 2007
 
12.
The act of getting wasted on drink or drugs ie. being in a retarded state.
man I drank so much last night I was retarded.
and
Lets get retarded.
by Zoomer October 24, 2003
 
13.
reasonable, refined, related, relevant, renewed, reputable, reputable, resolute, responsible, resulting in, rich, righteous, romantic, sane, satisfactory, sensible, sensical, sensing, sensitive, sententious, sentimental, serious, serious, shining, significant, sincere, smart, smooth, sociable, solid, something, somewhere, sophisticated, soulful, special, specific, spinted, stable, stand ground, standing, standing tall, steadfast, steady, strong, strong-hearted, strong-minded, strong-minded, stylish, suave, substantial, succeeded, succeeding, successful, sufficient, supreme, swan, sweet, sympathetic, tactful, thinking, thoughtful, titanic, to the purpose, toned, top, treasurable, treasure, treasured, true, truthful, unassailable, unassuming, uncompressed, uncorrupt, uncovert, undiscriminatory, undisputed, undoubtable, undoubting, unexpendable, unfrightened, unique, unloathsome, unmeasly, unpaniced, unperturbable, unpretentious, unquitting, unreplaceable, unridiculable, unrushed, unscared, unshabby, unshallow, unshameful, unstale, unsubmissive, untiring, untrifling, untrivial, untrumped, unvanishing, unwasting, unwavering, unwearied, up, upgraded, uplifting, usable, useful, varied, warm, wel-formed, well-advised, well-carried, well-considered, well-done, well-focusd, well-mannered, well-rounded, well-spoken, well-valued, well-wired, whole, winner, wise, with a home, with purpose, with reason, without need for repent, witty, witty, wonderful, working, worth, worthwhile, worthy.
Russel is retarded.
by Gossamer Willowfly July 10, 2011
 
14.
The state of being high, as in the Black Eyed Peas song, "Let's Get Retarded!"
What are you doing this weekend, 'cuz I wanna get retarded.
by ndavis000 January 11, 2005