ineffective (adj.)
- abortive
- aimless
- barren
- bootless
- counterproductive
- effete
- emasculate
- empty
- etiolated
- failing
- fatuous
- feckless
- forceless
- fruitless
- futile
- impotent
- inadequate
- inane
- incapable
- incompetent
- ineffectual
- inefficacious
- inefficient
- inept
- inferior
- inoperative
- invalid
- invertebrate
- lame
- lightweight
- maladjusted
- manque
- meaningless
- no-account
- nugatory
- pointless
- powerless
- purposeless
- spineless
- sterile
- stillborn
- superfluous
- unable
- unadapted
- unadjusted
- unavailable
- unavailing
- unendowed
- unequipped
- unfit
- unfortunate
- unproductive
- unqualified
- unsuccessful
- untalented
- useless
- vain
- weak
- worthless
