cold fish
a person who does not seem very friendly and does not show their emotions

[TahlilGaran] Dictionary of Contemporary English ▲

cold fish
a person who does not seem very friendly and does not show their emotions.
He isn't very demonstrative, but his mother was a cold fish so he probably gets it from her.

[TahlilGaran] English Idioms Dictionary ▲

cold fish
a distant and unfeeling person; a person who is unfriendly or does not mix with others
The man was a cold fish and cared little about his family.

The man is a cold fish and he has very few friends.

[TahlilGaran] English Idioms Dictionary ▲

cold fish
n., informal A queer person; a person who is unfriendly or does not mix with others.
No one knows the new doctor, he is a cold fish.
Nobody invites Eric to parties because he is a cold fish.

[TahlilGaran] English Idioms Dictionary ▲