useless (adj.)
- abortive
 - aimless
 - barren
 - bootless
 - counterproductive
 - deleterious
 - detrimental
 - disadvantageous
 - effete
 - empty
 - etiolated
 - failing
 - fatuous
 - feckless
 - fruitless
 - futile
 - good-for-nothing
 - harmful
 - hopeless
 - idle
 - impotent
 - impracticable
 - impractical
 - inadequate
 - inane
 - incompetent
 - ineffective
 - ineffectual
 - inefficacious
 - inefficient
 - inept
 - injurious
 - inoperative
 - inutile
 - invalid
 - lame
 - manque
 - meaningless
 - nonfunctional
 - nugatory
 - pointless
 - prejudicial
 - purposeless
 - sterile
 - stillborn
 - superfluous
 - unavailable
 - unavailing
 - unfavorable
 - unfortunate
 - unproductive
 - unprofitable
 - unrewarding
 - unserviceable
 - unsuccessful
 - unusable
 - unworkable
 - vain
 - worthless
 
An idler is a watch that wants both hands,
As useless if it goes as if it stands.
Where none admire, 't is useless to excel;
Where none are beaux, 't is vain to be a belle.