IPA: /ˌʌn.səˈspɛk.tɪŋ/
KK: /ʌnˈsʌspɛktɪŋ/
Not aware of something that could cause harm or trouble; trusting and not suspicious.
The unsuspecting tourists were caught off guard by the sudden rainstorm.
Unsuspecting → It is formed from "un-" (meaning not) and "suspect" (from Latin "suspicere", meaning to look up at or to suspect). The word "unsuspecting" means not having suspicion or not being aware of potential danger.
Think of 'not' ('un-') being added to 'suspect' — this helps you remember that 'unsuspecting' refers to someone who is not aware of any danger.