Synonyms of pernicious


1. baneful, deadly, pernicious, pestilent, noxious (vs. innocuous)

usage: exceedingly harmful

2. insidious, pernicious, subtle, harmful (vs. harmless)

usage: working or spreading in a hidden and usually injurious way; "glaucoma is an insidious disease"; "a subtle poison"

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See also: pernicious (Dictionary)