inefficacious

in·ef·fi·ca·cious

adj \(ˌ)i-ˌne-fə-ˈkā-shəs\

Definition of INEFFICACIOUS

: lacking the power to produce a desired effect : ineffective

— in·ef·fi·ca·cious·ly adverb

— in·ef·fi·ca·cious·ness noun

Examples of INEFFICACIOUS

1. <his efforts to restore the neglected houseplant back to health were belated and sadly inefficacious>
2. <an inefficacious medication for a rare form of tuberculosis>

First Known Use of INEFFICACIOUS

1658

Related to INEFFICACIOUS

Synonyms: counterproductive, feckless, hamstrung, ineffectual, ineffective, inefficient, inexpedient

Antonyms: effective, effectual, efficacious, efficient, expedient, operant, ultraefficient

Related Words: abortive, bootless, fruitless, futile, nonproductive, pointless, profitless, unavailing, unproductive, unprofitable, unsuccessful, useless, worthless

Near Antonyms: availing, beneficial, helpful, productive, profitable, successful, useful, worthwhile

see all synonyms and antonyms

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