PERNICIOUSLY

banefully, perniciously

(adverb) in a noxiously baneful way; “this banefully poisoned climate”

insidiously, perniciously

(adverb) in a harmfully insidious manner; “these drugs act insidiously”

Source: WordNet® 3.1

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Etymology

Adverb

perniciously (comparative more perniciously, superlative most perniciously)

In a pernicious manner.

Source: Wiktionary

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PERNICIOUS

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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