0 used to say what the most unpleasant or difficult situation could possibly be: --
She is at worst corrupt, and at best has been knowingly breaking the rules.
At worst, she can only tell you off for being late.
1 in the worst possible case: --
There’s no harm in applying for the job – at worst, they’ll turn you down.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
at worst