'Boastfully' definitions:

Definition of 'boastfully'

(from WordNet)
adverb
In a boastful manner; "he talked big all evening" [syn: boastfully, vauntingly, big, large]

Definition of 'Boastfully'

From: GCIDE
  • Boastful \Boast"ful\, a. Given to, or full of, boasting; inclined to boast; vaunting; vainglorious; self-praising. -- {Boast"ful*ly}, adv. -- {Boast"ful*ness}, n. [1913 Webster]