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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

Dealing with things sensibly and realistically in a way that is based on practical rather than ideal...

relating to Spain or the Spanish language

extremely large or great; huge

Serious, respectable, and unadventurous.

highest in position or rank

Quick, energetic, and active in movement or speech.