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ineffective

in·ef·fec·tive

ineffective

 
pronunciation:
In ih fek tihv
part of speech: adjective
definition 1: having little or no effect; not having the desired or intended effect.
Unfortunately, the new drug was found to be ineffective for treating the disease.
synonyms:
futile, impotent, useless, weak
antonyms:
effective, efficacious
similar words:
abortive, feeble, fruitless, nugatory, void, worthless
definition 2: not capable of producing or achieving the desired effect; incapable or inefficient.
synonyms:
incapable, inefficient, unproductive, useless
antonyms:
effective, efficacious, strong
similar words:
feeble, fruitless, futile, incompetent, inept, weak
derivations: ineffectively (adv.), ineffectiveness (n.)