1. harmful or poisonous to living beings
2. extremely unpleasant or offensive

Examples

• The factory released noxious fumes into the air.
• Workers wore masks to protect themselves from noxious chemicals.
• The noxious smell from the garbage made everyone feel sick.
• Noxious weeds can damage crops and harm livestock.
• The politician’s noxious remarks offended many voters.
• She found his noxious behavior completely intolerable.
• The noxious gas leak forced residents to evacuate the area.