ineffective

Definitions

Not producing any significant or desired effect.

Failing to achieve the intended result.

Lacking the power or capacity to be effective.

Examples

The new policy proved to be completely ineffective at reducing office noise.

He realized that his attempts to fix the leaking pipe were ineffective.

The medication was ineffective in treating her chronic condition.

Synonyms

futile useless inefficient unproductive incompetent vain fruitless

Antonyms

effective efficient productive competent successful potent capable