PERNICIOUS

insidious, pernicious, subtle

(adjective) working or spreading in a hidden and usually injurious way; “glaucoma is an insidious disease”; “a subtle poison”

baneful, deadly, pernicious, pestilent

(adjective) exceedingly harmful

Source: WordNet® 3.1

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Etymology

Adjective

pernicious (comparative more pernicious, superlative most pernicious)

Causing much harm in a subtle way.

Causing death or injury; deadly.

Synonym: attery

Anagrams

• superionic

Source: Wiktionary

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Per*ni"cious, a. Etym: [L. pernix, -icis.]

Definition: Quick; swift (to burn). [R.] Milton.

Per*ni"cious, a. Etym: [L. perniciosus, from pernicies destruction, from pernecare to kill or slay outright; per + necare to kill, slay: cf. F. pernicieux. Cf. Nuisance, Necromancy.]

Definition: Having the quality of injuring or killing; destructive; very mischievous; baleful; malicious; wicked. Let this pernicious hour Stand aye accursed in the calendar. Shak. Pernicious to his health. Prescott.

Syn.

– Destructive; ruinous; deadly; noxious; injurious; baneful; deleterious; hurtful; mischievous.

– Per*ni"cious*ly, adv., -- Per*ni"cious*ness, n.

Source: Webster’s Unabridged Dictionary 1913 Edition

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