It implies a lack of awareness or suspicion about something that is about to happen.
Here are some examples of how it can be used:
* "The unsuspecting tourists were unaware of the danger lurking in the alleyway."
* "She played the role of a sweet, unsuspecting friend, but she was actually plotting her revenge."
* "The unsuspecting victim had no idea he was being scammed."
Unsuspecting is often used to describe someone who is naive, trusting, or unaware of the risks involved in a situation.