unsympathetic adj. + Add to list US //ənˌsɪmpəˈθɛtɪk// UK //ʌnsˌɪmpəθˈɛtɪk// un·sym·pa·thet·ic SynonymsAntonymsEtymology Synonyms closeddisagreeableunappealingunkindlyunlikableunlikeable Antonyms sympatheticOrigin From un- + sympathetic.