efficacious

Effective; possessing efficacy.

Opposite of

inefficacious

Pronounced as (IPA)

/ˌɛf.ɪˈkeɪ.ʃəs/

Etymology

From Old French efficacieux, from Latin efficāx (“efficacious”) + -ous, from efficere (“to effect, to accomplish”); see effect.

Synonyms

effective

effectual

efficient

useful

strong

productive

fruitful

telling

powerful

mighty

potent

prediction

resulting

serviceable

smart

soul

spirit

spiritual

successful

supernatural

working

resultful

effectiveness

able

of a quick effect

active

divine

drastic

driving

energetic

high-performance

ingenious

intelligent

Translations

efficace

eficaz

efficace

eficaz

αποτελεσματικός

wirksam

effectief

werkzaam

eficiente

werkdadig

doeltreffend

skuteczny

effectif

efficax

afdoend