1550s, "not professing Christianity" (of persons), from un- (1) "not" + Christian (adj.). Meaning "at variance with Christian principles" (of actions) is recorded from 1580s.
权威例句
1. It was unchristian of him to refuse to help.
他拒绝帮忙,真是有失厚道.
2. Seeking vengeance is most unchristian in the extreme.