impossible
impracticable
achievable
brokered
cost-prohibitive
feasible
four-letter
glitchy
hamstring
hard-hit
impermissible
knowledgable
literate
quick-minded
reparable
spinous
swashbuckling
tone-deaf
underdeveloped
uneconomical
unfeasible
uninstructive
unparliamentary
unpunishable
unviable
unworkable