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Showing results for be efficacious. Search instead for highly efficacious.

be efficacious

VERB
take
Synonyms
STRONGEST
beat work
STRONG
operate prevail succeed triumph
WEAK
do the trick have effect
Antonyms
STRONG
fail lose
WEAK
abstain add avoid be honest be immune disallow discontinue disenchant dodge give hold keep maintain misconceive misunderstand offer receive refuse reject repulse stop

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.