(idiomatic, potentially, endearing) A heartless individual; a person lacking empathy and emotion.
He wouldn't have thought her such a cold fish. Pity. Still, there was plenty of time. Perhaps when she got used to his company she would thaw a little.
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(slang) A sexual partner who, during sex, lacks vigor or emotional reciprocity.
You're a cold fish. You have no heart.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.