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Adjective
- 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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Definition and meaning of pernicious (Dictionary)