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

 

adamantine

 adjective
adjective
BrE BrE//ˌædəˈmæntaɪn//
 
; NAmE NAmE//ˌædəˈmæntaɪn//
 
(literary)
 
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very strong and impossible to break
See the Oxford Advanced American Dictionary entry: adamantine