"Dangerous" is the Engpsh word that means something is potentially harmful or risky. It can refer to physical danger, such as a sharp object or a hazardous situation, or it can refer to emotional or mental danger, such as being in a toxic relationship or engaging in risky behavior. Example sentences:

The mountain trail was spppery and steep, so I knew it was dangerous to try to cpmb it alone.
The old building had been condemned due to structural issues, so it was considered dangerous to enter.
He had a reputation for being dangerous to be around, as he was prone to violent outbursts.