Definition of adamantine in English:

adamantine

Line breaks: ad¦am¦ant|ine
Pronunciation: /ˌadəˈmantʌɪn
 
/

adjective

literary
  • Unable to be broken: adamantine chains figurative her adamantine will
    More example sentences
    • Here is Prometheus, the rebel: nail him to the rock; secure him on this towering summit fast in the unyielding grip of adamantine chains.
    • They need hope - a kind of unflappable, adamantine hope.
    • I am possessed, as much as the next man, of that stiff upper lip, steely resolve and adamantine backbone which make us British positively megalithic in the face of danger.

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noun
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