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Definition of unclear - 2 dictionary results
un·clear   (ŭn-klîr')   
adj.   un·clear·er, un·clear·est
Not clearly defined; not explicit.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

unclear 
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.
Online Etymology Dictionary, © 2001 Douglas Harper
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