Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: pugnax, from pugnare 'to fight'

pugnacious

 adjective
     
pug‧na‧cious formal
very eager to argue or fight with people:
The professor had been pugnacious and irritable.
—pugnaciously adverb
—pugnacity noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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