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efficacious

ef·fi·ca·cious

efficacious

 
pronunciation:
e f keI shihs
features:
Word Combinations (adjective)
part of speech: adjective
definition: causing or capable of causing a desired result; effectual; effective.
The treatment showed signs of being efficacious for this group of patients.
antonyms:
ineffective, inefficacious
similar words:
effective, efficient, fruitful, valid
Word CombinationsSubscriber feature About this feature
derivations: efficaciously (adv.), efficaciousness (n.)