impossible
beyond one
functionless
impracticable
impractical
in disrepair
inapplicable
infeasible
inoperable
inoperative
insuperable
insurmountable
nonfunctional
nonutilitarian
otiose
out of order
out of whack
too much for
unachievable
unattainable
uncompassable
unconducive
undoable
uneffectible
unemployable
unfeasible
unfit
unhelpful
unnegotiable
unperformable
unrealizable
unserviceable
unsuitable
unsurmountable
unusable
useless
chimerical
cost-prohibitive
dissimilar
indefensible
inefficacious
insolvent
uncalled
unconstitutional
unconvinced
undetectable
unhistorical
uninhabitable
unobtainable
unreadable
unrealistic
unscriptural
unsustainable
untrue
valueless
workable