Suspicious Behavior

verb to stand or wait around without any purpose or reason

• The security guard warned the individuals not to loiter in front of the store.
• Hey, let's not loiter around here for too long, we might get in trouble.
• Don't loiter in this area, it's not safe.
• His thoughts seemed to loiter around the idea of quitting his job.

noun a person who loiters, especially one who hangs around a public place with no clear purpose

• The security guard asked the loiterer to move along from the entrance of the building.
• The loiterer was just hanging around outside the store, not buying anything.
• That loiterer is always lurking around the park, looking suspicious.
• His mind was like a loiterer, wandering aimlessly without purpose.

adjective causing one to have the belief or impression that something or someone is dishonest, dangerous, or questionable

• The police found some suspicious activity near the crime scene.
• I have a feeling something suspicious is going on with him.
• That guy gives me major sketch vibes, he's so suspicious.
• Her sudden change in behavior raised some suspicious eyebrows among her friends.