- in water deeper than one's height or too deep for one's safety.
- beyond one's knowledge or capability: The child is being taught subjects that are beyond his depth.
Origin of depth
Antonyms for depth
- in water deeper than one is tall
- beyond the range of one's competence or understanding
Word Origin for depth
late 14c., apparently formed in Middle English on model of length, breadth; from Old English deop "deep" (see deep) + -th (2). Replaced older deopnes "deepness." Though the English word is relatively recent, the formation is in Proto-Germanic, *deupitho-, and corresponds to Old Saxon diupitha, Dutch diepte, Old Norse dypð, Gothic diupiþa.
out of one's depth
Also, beyond one's depth. Outside one's understanding or competence, as in He was out of his depth in that advanced calculus class, or The conductor realized that playing the fugue at the right tempo was beyond their depth. This expression alludes to being in water so deep that one might sink. [c. 1600] Also see over one's head.
see in depth; out of one's depth.