shady

(adjective) unsafe, uncertain, questionable

Example Sentences:

A: Do you want to go to the restaurant in the bad part of town?
B: No, it’s kind of shady over there. Let’s go to McDonald’s instead.

The English student decided to choose a different tutor because she thought that Wayne was a bit shady.

We decided to call the police after a shady man was seen walking around our house. The cops told us he was trying to damage our car!

From the Blogs:

Shady stories

Media:

Similar idioms:

1. sketchy
2. dodgy
3. walking on air
4. have a clue
5. bulletproof