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at one's wit's end

at one's wit's end idiom

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).

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.