Definition of at its or someone's worst in English:

at its (or someone's) worst

In the most serious, undesirable, or unpleasant state: nothing’s working at the moment, so I suppose you’ve seen us at our worst
More example sentences
  • It's a very weird thing to look into the eyes of the person you know best, when you are at your worst, and discover they are happy to see it.
  • With temperatures falling below zero in many parts and sleet and rain forecast for the next few days, road conditions were reported to be at their worst in a decade, particularly in parts of the midlands and southeast.
  • The problems of dumping at the site in Broad Close car park are at their worst over the weekend, when piles of mixed waste and hundreds of cardboard boxes are thrown onto the ground, blocking access to the recycling banks.
See parent entry: worst

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Word of the day ween
Pronunciation: wēn
verb
be of the opinion; think or suppose