'Nastily' definitions:

Definition of 'nastily'

(from WordNet)
adverb
In a nasty ill-tempered manner; "`Don't expect me to help you,' he added nastily" [syn: nastily, meanly]

Definition of 'Nastily'

From: GCIDE
  • Nastily \Nas"ti*ly\, adv. In a nasty manner. [1913 Webster]