dead
defunct
down
barren
bootless
broken
counterproductive
effete
empty
etiolated
fatuitous
fatuous
feckless
fruitless
functionless
futile
haywire
in disrepair
inadequate
inane
inapplicable
ineffective
ineffectual
inefficacious
inoperable
invalid
nonfunctional
nonutilitarian
nugacious
nugatory
of no force
on the blink
on the fritz
otiose
out of commission
out of condition
out of gear
out of joint
out of kelter
out of kilter
out of order
out of repair
out of tune
out of whack
sterile
unavailing
unconducive
unemployable
unfit
unhelpful
unsuitable
unusable
impractical
inadmissible
indefensible
soundproof
unacceptable
unavailable
unconvinced
undamaged
undetectable
unimpressed
uninhabitable
uninterested
unjustified
unobtainable
unproductive
unprovided
unready
unresponsive
untenanted
untraceable
unworkable
valueless
operative
uncooperative