Antonyms for efficacious

Grammar : Adj

Spell : ef-i-key-shuh s

Phonetic Transcription : ˌɛf ɪˈkeɪ ʃəs

Definition of efficacious

Origin : "sure to have the desired effect" (often of medicines), 1520s, from Latin efficaci-, stem of efficax (see efficacy) + -ous. Related: Efficaciously; efficaciousness.

adj efficient, productive

Example sentences :

And some of the most efficacious burrowers have been their own spiritual children.
Extract from : « A Writer's Recollections (In Two Volumes), Volume I » by Mrs. Humphry Ward

Everyday influences, even the smallest and most dissimulated, are often the most efficacious.
Extract from : « The Sexual Question » by August Forel

Relics have served as efficacious instruments to accomplish that end.
Extract from : « Roman Catholicism in Spain » by Anonymous

Whatever the brew might be worth, the whisky certainly was efficacious.
Extract from : « The Heart of Thunder Mountain » by Edfrid A. Bingham

Efficacious as this mode of execution may seem, it was neither speedy nor merciful.
Extract from : « Fox's Book of Martyrs » by John Foxe

Dr. Owen will say that his prescription has been efficacious, but that is not true.
Extract from : « Possessed » by Cleveland Moffett

For the difficulty with the bladder we mentioned, diet is also efficacious.
Extract from : « The Physical Life of Woman: » by Dr. George H Napheys

And when I say learn, I mean learn in the least official and the most efficacious way.
Extract from : « Laurus Nobilis » by Vernon Lee

He had a most efficacious method of administering consolation.
Extract from : « My Ten Years' Imprisonment » by Silvio Pellico

The necessity of efficacious grace for effective action is a point of faith.
Extract from : « Pascal » by John Tulloch

Synonyms for efficacious

Based on : Thesaurus.com - Gutenberg.org - Dictionary.com - Random House Unabridged Dictionary, © Random House, Inc. 2019