Untenable and its opposite tenable come to us from Old French tenir ("to hold, have possession of") and ultimately from Latin tenēre ("to hold, occupy, possess"). We tend to use untenable in situations where an idea or position is so off base that holding onto it is unjustified or inexcusable. One way to hold onto the meaning of untenable is to associate it with other tenēre descendants whose meanings are associated with "holding" or "holding onto." Tenacious ("holding fast") is one example. Others are contain, detain, sustain, maintain, and retain.