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Someone who shows no emotion and comes across as unfriendly or disinterested. The manager decided not to hire Bill as the store greeter because he came across like a cold fish during the interview.
Fig. a person who is distant and unfeeling. (*Typically: act like ~; be ~.) Bob is so dull—a real cold fish. She hardly ever speaks to anyone. She's a cold fish.
A hard-hearted, unfeeling individual, one who shows no emotion, as in Not even the eulogy moved him; he's a real cold fish. This expression was used by Shakespeare in The Winter's Tale (4:4): "It was thought she was a woman, and was turn'd into a cold fish." However, it came into wider use only in the first half of the 1900s.
a cold fish
If you call someone a cold fish, you mean that they do not show their emotions and can seem unfriendly or unsympathetic. Since the President is generally seen as a cold fish, it is all the more impressive when he does show his feelings. He didn't really show much emotion — he's a bit of a cold fish.
a ˌcold ˈfish(disapproving) a person who shows little or no emotion, or is unfriendly, reserved, etc: When I first met him, he seemed rather a cold fish, but actually he’s quite passionate.
n. a dull and unresponsive person. I hate to shake hands with a cold fish like that. He didn’t even smile.