[1690–1700; un-2 + ruffle]This word is first recorded in the period 1690–1700. Other words that entered Englishat around the same time include: cocoon, foolscap, freshen, migrate, momentumun- is a prefix freely used in English to form verbs expressing a reversal of some actionor state, or removal, deprivation, release, etc. (unbend; uncork; unfasten; etc.), or to intensify the force of a verb already having such a meaning (unloose)