Meaning of “unsympathetic” - Learner’s Dictionary

unsympathetic

adjective uk us /ˌʌnsɪmpəˈθetɪk/
WITHOUT SYMPATHY

showing that you do not understand or care about someone's problems:

I told him I'd got a cold but he was completely unsympathetic.
NOT SUPPORTING

not agreeing with or supporting someone's ideas or actions

(Definition of “unsympathetic” from the Cambridge Learner’s Dictionary © Cambridge University Press)