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

 

pugnacious

 adjective
adjective
BrE BrE//pʌɡˈneɪʃəs//
 
; NAmE NAmE//pʌɡˈneɪʃəs//
 
(formal)
 
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having a strong desire to argue or fight with other people synonym bellicose Word Origin mid 17th cent.: from Latin pugnax, pugnac- (from pugnare ‘to fight’, from pugnus ‘fist’) + -ious.
See the Oxford Advanced American Dictionary entry: pugnacious