Definitions

from The Century Dictionary.

  • In a pernicious or hurtful manner; destructively; with ruinous tendency or effect.
  • Maliciously; malignantly.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adverb In a pernicious manner.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adverb in a noxiously baneful way
  • adverb in a harmfully insidious manner

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

pernicious +‎ -ly

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