Definition of inefficacious in English:

inefficacious

adjective

  • Not producing the desired effect.

    ‘social conventions honed over thousands of years were suddenly inefficacious’
    • ‘The ambitious but inefficacious poor soul has tried his best.’
    • ‘Functionalism certainly does not imply that the mind is inefficacious.’
    • ‘Then I just started wittering in a pretty inefficacious way at the Carribean customer service woman.’
    • ‘Several writers argue that terrorism is generally inefficacious, strategically counterproductive and unsuccessful in attaining socio-political objectives.’
    • ‘But though it is not absolutely efficacious under all circumstances, it is of great potency always, and rarely inefficacious.’
    ineffective, unsuccessful, non-successful, unproductive, fruitless, profitless, unprofitable, abortive, failed, futile, purposeless, worthless, useless, ineffectual, inefficient, inadequate, vain, unavailing, to no effect
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Pronunciation

inefficacious

/ˌɪnɛfɪˈkeɪʃəs/