a substance that can cause illness, injury, or death when introduced into a body.

something that has a harmful or corrupting influence.

हानिकारक प्रभाव

English Usage: "The gossip acted as a poison in their friendship."

Hindi Usage: "आशंका उनके मित्रता में एक हानिकारक प्रभाव के रूप में कार्य करती थी।"