impossible
beyond one
impracticable
impractical
infeasible
inoperable
insuperable
insurmountable
too much for
unachievable
unattainable
uncompassable
undoable
uneffectible
unnegotiable
unperformable
unrealizable
unsurmountable
unworkable
bereft
counterproductive
different
hamstring
hard-hit
justify
knowledgable
quick-minded
recoverable
reparable
self-degradation
tendencies
tone-deaf
unattained
unprocurable
unselfconscious
unsustainable
unviable
well-based
feasible