unchristianPronunciation: /ʌnˈkrɪstʃ(ə)n, -tɪən/Definition of unchristian adjective not professing Christianity or its teachings. informal unkind, unfair, or morally wrong: she was possessed of a very unchristian suspicion about her half sisterDerivatives unchristianly adjective & adverb unchristian in other Oxford dictionaries Definition of unchristian in the US English dictionary