Meaning of “at your worst” in the English Dictionary

british dictionary

"at your worst" in British English

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at your worst

less active or intelligent than you are at other times:

I'm at my worst first thing in the morning.

showing the most unpleasant side of someone's character:

This problem over late payment has shown him at his worst.

(Definition of “at your worst” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)