Synonyms: pestiferous, pestilent, pestilential, plaguey
Definition: likely to spread and cause an epidemic disease
Usage: a pestilential malignancy in the air- Jonathan Swift; plaguey fevers
Similar words: epidemic
Definition: (especially of medicine) of disease or anything resembling a disease; attacking or affecting many individuals in a community or a population simultaneously
Usage: an epidemic outbreak of influenza
Synonyms: pernicious, pestilent, deadly, baneful
Definition: exceedingly harmful
Similar words: noxious
Definition: injurious to physical or mental health
Usage: noxious chemical wastes; noxious ideas