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inefficacious

adjective

ˌɪn.ɪ.fɪˈkeɪ.ʃəs

Meaning

Not producing any or the desired effect; ineffective.

The treatment was inefficacious in curing the disease.

ineffective, futile, useless

effective, powerful, productive

containing or based on error; incorrect or mistaken

Lively, entertaining, or slightly shocking (especially in a sexual way).

not level or smooth; not regular or consistent

Showing great effort or energy without becoming tired.

expressing sadness or sorrow

Depending on or relating to the circumstances or setting; context-dependent.