Dodgy (adjective)

1. Likely to be unreliable, untrustworthy, or deceitful.
2. Likely to be of poor quality or unsafe.

Origin:

Early 20th century: of uncertain origin.

Examples:

1. The used car seemed dodgy and I decided not to buy it.
2. The seller had a dodgy reputation.
3. He gave a dodgy excuse for being late.
4. The building had a dodgy structure and was in danger of collapsing.
5. The food in that restaurant looked dodgy and I decided not to eat there.