Etymology
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unsuspecting (adj.)

1590s, from un- (1) "not" + present participle of suspect (v.).

updated on September 28, 2012

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Definitions of unsuspecting from WordNet

unsuspecting (adj.)
not suspicious;
deceiving the unsuspecting public
Synonyms: unsuspicious
unsuspecting (adj.)
(often followed by `of') not knowing or expecting; not thinking likely;
unsuspecting (or unaware) of the fact that I would one day be their leader
an unsuspecting victim
From wordnet.princeton.edu, not affiliated with etymonline.