[1605–15; un-2 + wrinkle1]This word is first recorded in the period 1605–15. Other words that entered Englishat around the same time include: classic, ideal, package, pivot, seriesun- 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)