Synonyms for (adjective) pernicious

Synonyms: insidious, pernicious, subtle

Definition: working or spreading in a hidden and usually injurious way

Usage: glaucoma is an insidious disease; a subtle poison

Similar words: harmful

Definition: causing or capable of causing harm

Usage: too much sun is harmful to the skin; harmful effects of smoking


Synonyms: pernicious, pestilent, deadly, baneful

Definition: exceedingly harmful

Similar words: noxious

Definition: injurious to physical or mental health

Usage: noxious chemical wastes; noxious ideas