Word Study
perniciously
WORDNET DICTIONARY
Adverbial perniciously has 2 senses
- perniciously(r = adv.all) insidiously - in a harmfully insidious manner; "these drugs act insidiously"
- perniciously(r = adv.all) banefully - in a noxiously baneful way; "this banefully poisoned climate"
For further exploring for "perniciously" in Webster Dictionary Online