Search Result for "perniciously": 
Wordnet 3.0

ADVERB (2)

1. in a harmfully insidious manner;
- Example: "these drugs act insidiously"
[syn: insidiously, perniciously]

2. in a noxiously baneful way;
- Example: "this banefully poisoned climate"
[syn: banefully, perniciously]



The Collaborative International Dictionary of English v.0.48:

Pernicious \Per*ni"cious\, a. [L. perniciosus, from pernicies
   destruction, from pernecare to kill or slay outright; per +
   necare to kill, slay: cf. F. pernicieux. Cf. Nuisance,
   Necromancy.]
   Having the quality of injuring or killing; destructive; very
   mischievous; baleful; malicious; wicked.
   [1913 Webster]

         Let this pernicious hour
         Stand aye accursed in the calendar.      --Shak.
   [1913 Webster]

         Pernicious to his health.                --Prescott.
   [1913 Webster]

   Syn: Destructive; ruinous; deadly; noxious; injurious;
        baneful; deleterious; hurtful; mischievous.
        [1913 Webster] -- Per*ni"cious*ly, adv., --
        Per*ni"cious*ness, n.
        [1913 Webster]


WordNet (r) 3.0 (2006):

perniciously
    adv 1: in a harmfully insidious manner; "these drugs act
           insidiously" [syn: insidiously, perniciously]
    2: in a noxiously baneful way; "this banefully poisoned climate"
       [syn: banefully, perniciously]