Etymology
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unawares (adv.)

1530s, "without being aware," from un- (1) "not" + aware + adverbial genitive -s. Meaning "without being noticed" is recorded from 1660s. Form unaware is recorded from 1590s.

updated on June 18, 2012

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Definitions of unawares from WordNet

unawares (adv.)
without forethought or plan; inadvertently;
came upon the diamond unawares
unawares (adv.)
suddenly and unexpectedly; "sorrow comes to all, and to the young it comes with bittered agony because it takes them unawares"- A.Lincoln;
rain caught them unawares
unawares (adv.)
at a disadvantage;
Synonyms: short
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.