unsuspecting /ˌʌnsəˈspɛktɪŋ/ adjective /ˌʌnsəˈspɛktɪŋ/
adjective
Learner's definition of UNSUSPECTING
[more unsuspecting; most unsuspecting]
: not knowing about or expecting something bad that is going to happen or that could happen(对坏事)毫不知晓的,未预料到的,无戒备心的