At worst means in the worst case. Most often it's used to reassure: the worst outcome is named, and it isn't scary. Try asking again; at worst, they will say no. At worst, we'll have to wait for the next bus. In criticism it pairs with at best: The error is confusing at best and dangerous at worst.
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at worst, + possible outcome / adjective + at worst
- At worst, we'll have to wait for the next bus.
- The error is confusing at best and dangerous at worst.
- Try asking again; at worst, they will say no.
What changed
First versionAt worse, we'll need to change the date.
RevisionAt worst, we'll need to change the date.
Worse and worst sound almost the same, so worse ends up in the phrase. But at worst is the extreme, the very worst option, so it needs the superlative: worst. Worse only compares: worse than yesterday.
In the worst case means the same but is longer and takes an article: In the worst case, we'll cancel. At worst is shorter and sounds more natural in speech. At my worst is about a person, 'in my worst state': I'm at my worst in the morning.
Your turn
The least favourable possible outcome is a short delay: At ___, we'll leave an hour late.
Show the answer
worst — You need the superlative: at worst. Worse is a comparative; it compares two options and isn't part of this phrase.
A friend is afraid to ask for a pay rise. Encourage them in one sentence with at worst.
Just ask — at worst, your boss will say no.
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