Not suspicious; trusting.

not suspicious; "deceiving the unsuspecting public"

(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"

adjective

conscious , expecting , knowing , realizing , suspecting

adjective

confiding , credulous , easy , inexperienced , ingenuous , innocent , naive , off guard , simple , swallowing , taken in , trustful , trusting , unconscious , undoubting , unsuspicious , unwarned , unwary , gullible , indubious , unaware , unsophisticated