untenable

adj.难以防守的,站不住脚的

unsteadiness, unsteady, unstinting, unstintingly, unstop, unstoppable, unstuck, unstudied, unsubstantiated, unsuccessful, unsuitable, unsung, unsure, unsuspecting, unswerving, unsympathetic, untainted, untalented, untangle, untapped, unthinkable, unthinking, unthinkingly, unthreatening, untidily, untidiness, untidy, untie, until, until (also till), untimeliness, untimely, untired, untiring, untiringly, untitled, untold, untouchable, untouched, untoward,