Old English unmæte "immoderate, excessive," from un- (1) "not" + meet (adj.). Similar formation in Old High German unmazi. Meanings "unfitting" and "unsuited" (for some purpose) are from 1520s.
unmastered
unmatched
unmeaning
unmeasurable
unmediated
unmeet
unmentionable
unmerciful
unmerited
unmet
unmindful