Untiefe

Etymology
Formally. The nautical sense “shallows” is chiefly from (compare 🇨🇬). It is also attested in, but seemingly not in Middle High German. In the sense “abyss”, the prefix takes the meaning “inconceivable” as, for example, in. It is first attested in.

Noun

 * 1)  shallows; shoal; shallow depth
 * 2)  abyss; precarious depth
 * 1)  abyss; precarious depth
 * 1)  abyss; precarious depth

Usage notes

 * Untiefe is a contranym. Note, however, that the figurative use of 2 is actually not contradictory to sense 1, since both refer to a dangerous spot. Literal uses of sense 2 are rare in contemporary German.