34 ineffective synonyms include unsuccessful, non-successful, unproductive, fruitless, profitless, unprofitable, abortive, failed, futile, and purposeless. Ineffective is an adjective, and its antonyms are effective and efficient. Here are some additional synonyms for "ineffective" with example sentences.
34 other ways to say ineffective.
His attempts to fix the problem were ineffective.
The medicine was ineffective against the infection.