1. the quality of being harmful, poisonous, or very unpleasant

Examples

• The noxiousness of the chemical fumes forced workers to evacuate the building.
• Environmental scientists studied the noxiousness of various pollutants in the water supply.
• The noxiousness of his behavior made him unwelcome at social gatherings.
• Regulations were put in place to reduce the noxiousness of industrial waste.
• The plant’s natural noxiousness protects it from being eaten by animals.
• She complained about the noxiousness of the smell coming from the garbage dump.