"unsuspecting" in the adjective sense
1. unsuspecting, unsuspicious
not suspicious
"deceiving the unsuspecting public"
2. unsuspecting
often followed by `of') not knowing or expecting not thinking likely
"an unsuspecting victim"
"unsuspecting (or unaware) of the fact that I would one day be their leader"
Source: WordNet® (An amazing lexical database of English)
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