c.1300, "not easy to understand," from
un- (1) "not" +
clear (adj.). Cf. M.Du.
onclaer, Du.
onklaar, Ger.
unklar, O.N.
uklarr, Dan.
uklar, Swed.
oklar. Of persons, in sense of "uncertain, doubtful," it is recorded from 1671.
Uncleared is recorded from 1637 in ref. to debts, 1772 in ref. to land.
(ŭn-klîr') 