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defficacious

Adjective: Successful in producing a shitty results; ineffective.

Contrast with "efficacious".
The medicine was defficacious; My cough only worsened after taking it.

His defficacious work resulted in extended work hours for all his co-workers.
by efficacious_eruditer October 20, 2012
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efficacious

When trying to impress with his vocabulary by using the word 'efficacious' rather than 'effective', the man was actually more efficacious at sounding like an ass.
by dgeezy May 13, 2015
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Related Words

defecacious

Having the ability to find a good, clean place to take a shit, by instinct alone. A portmanteau word from "DEFEcate + effiCACIOUS.
I don't know how George found that nice, clean rest stop five miles down the highway---he's very defecacious!
by pentozali September 9, 2012
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efficacious

An adjective (descriptive word):

Describing thing, or person, producing, or sure to produce, desired effect.

"Efficaciously" (adverb) describing the behaviour of act in such a manner as to effect the desired effect.
I may help to understand that the Latin root for these words is the same as that for "Efficient".
Asprin is truly "efficacious" for the treatment of headaches.

I've never known a teacher to be so consistent in dealing so "efficaciously" with problem students, as he does.
by Sparticus774 May 27, 2014
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