
Not/never in a hundred, etc. years
Strong Refusal
Used to strongly deny willingness or likelihood of an action or event.

Start a snake farm? Not in a hundred years!
Emphasis on Improbability
Stresses how an action or event is extremely unlikely to occur.

Not in a hundred years would that timid cat attack the dog.
Colloquial Expression
Commonly used in informal conversation rather than formal writing.

Hike up the mountain in this weather? Never in a hundred years!
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