futile
ineffectual
inutile
otiose
unavailing
unserviceable
unusable
unuseable
abortive
aimless
barren
bootless
counterproductive
dead
deleterious
detrimental
disadvantageous
disserviceable
effete
empty
etiolated
failed
failing
fatuitous
fatuous
feckless
fruitless
fustian
good-for-nothing
harmful
helpless
hopeless
idle
impotent
impracticable
impractical
inadequate
inane
inapplicable
incompetent
ineffective
inefficacious
inefficient
inept
injurious
inoperative
invalid
lame
manque
meaningless
dangerous
foolish
mere
miserable
unnecessary
worthless
serviceable
usable
useful