Synonyms of ineffective in English:

ineffective


See US English definition of ineffective

See UK English definition of ineffective

See Spanish definition of ineficaz

adjective

1‘they made an ineffective attempt to resolve the issue’

SYNONYMS
unsuccessful, non-successful, unproductive, fruitless, profitless, unprofitable, abortive, failed, futile, purposeless, worthless, useless, ineffectual, inefficient, inefficacious, inadequate, vain, unavailing, to no effect
idle, feeble, weak, inept, lame
archaic bootless
rare unfructuous, inutile
ANTONYMS

effective

2‘he was a weak and ineffective president’

SYNONYMS
ineffectual, inefficient, inefficacious, unsuccessful, powerless, impotent, inadequate, incompetent, incapable, unfit, inept, lame, feeble, weak, poor
informal useless, hopeless
ANTONYMS

effective