at one's wit's end

Also, at wits' end. Completely puzzled and perplexed, not knowing what to do. For example, I've tried every possible source without success, and now I'm at my wit's end. This idiom, which uses wit in the sense of "mental faculties," appeared in Piers Ploughman (c. 1377).

Common Names:

Name	Pronounced	Usage
Stephen	STEEV-ən (English), STEF-ən (English)	English, Biblical
Gertrudes	-	Portuguese
Tabita	-	Biblical Latin
Hubert	HYOO-bərt (English), HOO-bert (German), HUY-bərt (Dutch), uy-BER (French), HUW-bert (Polish)	English, German, Dutch, French, Polish, Ancient Germanic
Tatum	TA-təm	English (Modern)
Sonya	['səunjə]