The story
- Middle English · inherited fromunclere
- English todayunclear
From Middle English unclere, equivalent to un- + clear. Compare Saterland Frisian uunkloor (“unclear”), West Frisian ûnklear (“inoperative, broken”), Dutch onklaar (“out of order, defective, broken”), German unklar (“unclear”), Danish uklar (“unclear”), Swedish oklar (“unclear”).
Etymology from Wiktionary, CC BY-SA 4.0.