Etymology
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wary (adj.)

late 15c., with -y (2) + ware, from Old English wær "prudent, aware, alert, wary," from Proto-Germanic *waraz (source also of Old Norse varr "attentive," Gothic wars "cautious," Old Saxon giwar, Middle Dutch gheware, Old High German giwar, German gewahr "aware"), from PIE root *wer- (3) "perceive, watch out for." Related: Warily; wariness.

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Definitions of wary

wary (adj.)
marked by keen caution and watchful prudence;
they were wary in their movements
a wary glance at the black clouds
taught to be wary of strangers
wary (adj.)
openly distrustful and unwilling to confide;
Synonyms: leery / mistrustful / suspicious / untrusting
From wordnet.princeton.edu