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ineffective/ineffectual

ADJECTIVE

weak, useless

Synonyms

WEAK

abortive anticlimactic barren bootless defeasible feckless feeble forceless fruitless futile idle impotent inadequate incompetent indecisive inefficacious inefficient inept inferior innocuous inoperative invertebrate lame limited neutralized nugatory null null and void paltry powerless spineless unable unavailing unfruitful unproductive unprofitable unsuccessful vain void withered worthless

Antonyms

WEAK

competent effective effectual efficient powerful strong useful