[uhn-shoo r, ‐shur]


not certain or confident: He arrived at the party unsure of his welcome.

Origin of unsure

1400–50; Middle English; see un-1 + sure
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unsure

Contemporary Examples of unsure

Historical Examples of unsure

  • For the first time since Hilton had known him, the Oman's mind was confused and unsure.

    Masters of Space

    Edward Elmer Smith

  • I could see that she was keener than ever, and beginning to be a little worried and unsure of herself!

    Man and Maid

    Elinor Glyn

  • We are called above the earthly loves that come and go, and are unsure.

  • When you start to be afraid, you start to be unsure—not of anyone else's weaknesses, but of your own.

    Breaking Point

    James E. Gunn

  • "Anna," he said, as if he answered her from a distance, unsure.

    The Rainbow

    D. H. (David Herbert) Lawrence

British Dictionary definitions for unsure



lacking assurance or self-confidence
(usually postpositive) without sure knowledge; uncertainunsure of her agreement
precarious; insecure
not certain or reliable
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unsure

c.1400, "not safe against attack," also "lacking certainty," from un- (1) "not" + sure (adj.).

Online Etymology Dictionary, © 2010 Douglas Harper