efficacious 

A douchey way of saying effective.

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.

efficacious by dgeezy May 13, 2015

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.

efficacious by Sparticus774 May 27, 2014

efficascious 

Adj. describing a wildly unpopular person who scrutinizes over every move you make.

"Did the substitute write you up for talking?"

"yeah and she's an efficascious bitch for doing it, too."

efficascious by tenahj March 9, 2008

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.

defficacious by efficacious_eruditer October 20, 2012

effacious 

Adj. Having a conversation with someone whom finds it awkward, or a conversation they do not want to have

The conversation with Troy regarding his sexual activity turned to be quite effacious.

I am finding every effacious conversation with him to make me avoidant of every conversation whatsoever.

effacious by Baroque Back August 18, 2017