efficace 

(eff-ee-kaas) efficient and effective. a single action that solves more than one problem or serves more than one purpose at once with minimal effort. elegant.

weakening an opponents position while strengthening your own in a single action, thereby doubling your advantage.

All his hard work and planning was outdone by the efficace of his opponent's actions.

efficace by cris clark February 22, 2007

efficated 

Fucked up or wrong

This glass is efficated

efficated by Cockydick May 31, 2017

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

self-efficacy 

1. when a person believes in their own ability to complete a task.

2. when someone poops themself.

1. Self-efficacy led Stephanie to believe she could make good marks on the exam.

2. Stephanie was unable to finish the exam due to self-efficacy.

self-efficacy by WHUler February 25, 2010

efficacy

1. The division of the product of a unit's hit points and damage by its attack period
2. The derivative of impact

A rifleman's efficacy turns out to be 7070.

efficacy by anonymous July 12, 2004

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