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

 

obdurate

 adjective
adjective
BrE BrE//ˈɒbdjərət//
 
; NAmE NAmE//ˈɑːbdərət//
 
(formal, usually disapproving)
 
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refusing to change your mind or your actions in any way synonym stubborn an obdurate attitude to remain obdurate Some members of the committee are likely to prove obdurate on this matter. Word Origin late Middle English (originally in the sense ‘hardened in sin, unrepentant’): from Latin obduratus, past participle of obdurare, from ob- ‘in opposition’ + durare ‘harden’ (from durus ‘hard’).
See the Oxford Advanced American Dictionary entry: obdurate