1550s, "not professing Christianity" (of persons), from un- (1) "not" + Christian (adj.). Meaning "at variance with Christian principles" (of actions) is recorded from 1580s.
uncharted
unchartered
unchaste
unchecked
unchivalrous
unchristian
unchurched
uncial
uncirculated
uncircumcised
uncivil
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