Venomousness refers to the quality of being poisonous or harmful. Some synonyms for venomousness include toxicity, noxiousness, and malignancy. Toxicity suggests the ability of a substance to cause harm or injury through chemical reaction, while noxiousness refers to the quality of being harmful or unpleasant, especially in terms of smell. Malignancy is a term more often associated with cancerous growths, but can also refer to the harmful or destructive qualities of a person's actions or words. Other potential synonyms for venomousness include virulence, malevolence, and hostility. Ultimately, each of these terms captures a different aspect of the quality of being harmful or poisonous.