Dangerous (adjective)

1. Posing a risk of harm, injury, or loss.
2. Capable of causing harm, injury, or loss.
3. Likely to cause harm, injury, or loss.
4. Capable of causing danger.
5. Involving or threatening danger.

Origin:

From middle english daungerous, from old french dangereus, from dangier ("danger") + -eux ("-ou.s")

Examples:

1. This is a dangerous situation.
2. That was a dangerous move.
3. He is a dangerous criminal.
4. She is a dangerous driver.
5. It was a dangerous animal.