ineffectual

Not producing the desired effect: synonym: futile.

Lacking forcefulness or effectiveness; inadequate or incompetent.

Not effectual; not producing or not able to produce the desired effect; of no efficacy; inefficient: as, an ineffectual remedy.

Synonyms Fruitless, Unavailing, etc. See useless.

Not producing the proper effect; without effect; inefficient; weak; useless; futile; unavailing

unable or insufficient to produce effect; futile

worthless

weak; lacking forcefulness

lacking in power or forcefulness

producing no result or effect