unimplementable
uncreatable
inextricable
unperformable
unappliable
unproducible
unactable
unadaptably
inconstructible
unconstructable
unconstructible
couldn't organise a piss-up in a brewery
undoable
unrealizable
unachievable
unattainable
unfreeable
uncoinable
unfundable
uncompilable
unprotectable
unsimulable
unaidable
inobtainable
unestablishable
unhandleable
unstartable
unrepairable
undesignable
approachless
unborable
uncomposable
unactivatable
unguidably
insuperable
uncontrollable
nonpossible
unformable
ungrowable
unimpossible
inevaluable
ununifiable
unguidable
untouchable
nonfeasible
conflict
infeasible
unobtainable
unprogrammable
inaccessible