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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
 
22.
To slow down or hinder development.
The embalming fluid retarded the decomposition of the corpse.
by William H Ballard III February 12, 2004
 
23.
1. Occurring or developing later than desired or expected; delayed. Relatively slow in mental or emotional or physical development

-This is NOT ment as an adjective to replace stupid, dumb, annoying, unitelligant or any other negative word. This is and only should be used to describe a child that was born with a mental or physcial miscomunication.

Spread the word to end the word.
"That's retarded."
"No, that's stupid, not retarded."
by SpreadTheWord22 November 02, 2011
 
24.
Human beings who are the least understood.
Think before you say "that's retarded"
by anon 174 September 07, 2011
 
25.
1. an adjective used to describe something that is slow.

2. slang for stupid, dumb, etc.

3. mentally handicapped

4. adjective used to describe people who get offended over the slang use of the word (#2)
1. Wow, that tree's growth has been quite retarded from its lack of water.

2. Wow Bob, you lit the cat on fire, you're fucking retarded.

3. Jim is in special ed, he's retarded.

4. You're fucking retarded, nobody is making fun of your cousin with down syndrome when they call someone else retarded.
by retardedPerson November 19, 2009
 
26.
A gifted person that is often unappreciated <3
Look at that retarded guy.... Really? Where? All I see is a gifted person created by God
by isaybrahhh July 31, 2011
 
27.
The Republian Political Party. Republicans are widely considered conservative and unwilling to make progressive social and financial policy changes for the betterment of society, thus RETARDING the advancement of society.
The Bush Administration and the Republican Congress have retarded progress in the United States over the past 10 years and caused a huge economic depression as a result of their retarded ways of thinking.
by Cityzenx May 01, 2010
 
28.
(From dictionary.com)

The legitimate definition:
Retarded
–verb (used with object)
1. to make slow; delay the development or progress of (an action, process, etc.); hinder or impede.

This term is being eliminated across the U.S by advocates for the developmentally disabled because for individuals of higher functioning intellectual impairment, it is demeaning and belittling.

Unfortunately, the word "retarded" (in my opinion) is frequently used--but only by shallow people easily influenced by societal expectations. The slang for "retarded" is frequently used to express contempt or disgust at a person, situation, or idea. Basically, anything the person who says it can't wrap their head around.
1.) Dude, it's like, George Bush is retarded, man.

2.) What, we have a test tomorrow I didn't see coming? That's retarded. Our teacher is totally retarded.

3.) Carrot top is such a retard. He's someone I don't think is funny. He is someone I will make fun of at the cost of someone dealing with serious life-altering psychological issues.

4.) I was driving drunk, and this fucking cop pulled me over because I was swerving over the median or some shit. He was such a retard.

5.) Dude, the dude who wrote this entry is fucking retarded man. That's the only way I can describe it, bro. Cause, dude, man--he doesn't even fuckin' get it, i mean--you know?
by look in the mirror September 22, 2009