Definition of boastful adjective from the Oxford Advanced Learner's Dictionary

 

boastful

 adjective
adjective
BrE BrE//ˈbəʊstfl//
 
; NAmE NAmE//ˈboʊstfl//
 
(disapproving) Proud
 
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talking about yourself in a very proud way I tried to emphasize my good points without sounding boastful. See related entries: ProudExtra examples Emphasize your good points without sounding boastful. He was rather boastful and vain. The adverts are unashamedly boastful. This is not simply a boastful assertion.
See the Oxford Advanced American Dictionary entry: boastful