'Guiltily' definitions:

Definition of 'guiltily'

(from WordNet)
adverb
In the manner of someone who has committed an offense; "she blushed guiltily as she spoke"

Definition of 'Guiltily'

From: GCIDE
  • Guiltily \Guilt"i*ly\ (g[i^]lt"[i^]*l[y^]), adv. In a guilty manner. [1913 Webster]