Past Tenses
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Efficacious Antonyms

Trying to find opposite word for efficacious in English? No problem. Our site contains antonyms of efficacious in 8 different contexts. We have listed all the opposite words for efficacious alphabetically.

impotent
  • barren
  • crippled
  • dud
  • effete
  • enervated
  • enfeebled
  • feeble
  • forceless
  • frail
  • gutless
  • helpless
  • inadequate
incapable
  • butterfingers
  • disqualified
  • feeble
  • impotent
  • inadequate
  • incompetent
  • ineffective
  • ineligible
  • inept
  • inexperienced
  • inexpert
  • inproficient
inefficacious
  • abortive
  • anticlimactic
  • barren
  • bootless
  • defeasible
  • feckless
  • feeble
  • forceless
  • fruitless
  • futile
  • idle
  • impotent
inefficient
  • can't hack it
  • careless
  • disorganized
  • extravagant
  • faulty
  • feeble
  • half-baked
  • improficient
  • improvident
  • incapable
  • incompetent
  • ineffective
unproductive
  • barren
  • empty
  • fruitless
  • futile
  • ineffective
  • infertile
  • pointless
  • sterile
  • trivial
  • unprofitable
  • useless
  • worthless
unsuccessful
  • abortive
  • defeated
  • disastrous
  • doomed
  • failed
  • foiled
  • fruitless
  • futile
  • ill-fated
  • ineffective
  • ineffectual
  • losing
useless
  • abortive
  • bootless
  • counterproductive
  • disadvantageous
  • dysfunctional
  • expendable
  • feckless
  • fruitless
  • futile
  • good-for-nothing
  • hopeless
  • idle
weak
  • anemic
  • debilitated
  • decrepit
  • delicate
  • effete
  • enervated
  • exhausted
  • faint
  • feeble
  • flaccid
  • flimsy
  • forceless

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