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

 

petulant

 adjective
adjective
BrE BrE//ˈpetjulənt//
 
; NAmE NAmE//ˈpetʃələnt//
 
 
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bad-tempered and unreasonable, especially because you cannot do or have what you want He behaved like a petulant child and refused to cooperate. Her tone of voice became abrupt and petulant. Word Origin late 16th cent. (in the sense ‘immodest’): from French pétulant, from Latin petulant- ‘impudent’ (related to petere ‘aim at, seek’). The current sense (mid 18th cent.) is influenced by pettish.
See the Oxford Advanced American Dictionary entry: petulant