单词：adamantine 

形容词

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  [1.a.adamantine] (同义词:[adamantine( adj. 非常坚硬的, 坚定不移的 n. [冶]金刚合金 )]  )
• 
  注释列句：consisting of or having the hardness of adamant
• 属于名词 -> [adamant( adj. 坚硬的 )] 
  
• 
  [2.a.adamantine] (同义词:[adamantine( adj. 非常坚硬的, 坚定不移的 n. [冶]金刚合金 )]  )
• 
  注释列句：having the hardness of a diamond
• 近义词 -> [hard( adj. 硬的, 坚固的, (问题, 工作等)困难的, 艰苦的, 猛烈的, 确实的 adv. 努力地, 辛苦地, 坚硬地, 牢固地, 接近地, 猛烈地 )] 
  
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  [3.a.adamantine] (同义词:[adamant( adj. 坚硬的 )]  [adamantine( adj. 非常坚硬的, 坚定不移的 n. [冶]金刚合金 )]  [inexorable( adj. 无情的 )]  [intransigent( adj. 非妥协性的 n. 不妥协的人 )]  )
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  注释列句：impervious to pleas, persuasion, requests, reason; "he is adamant in his refusal to change his mind"; "Cynthia was inexorable; she would have none of him"- W.Churchill; "an intransigent conservative opposed to every liberal tendency"
• 近义词 -> [inflexible( adj. 不屈的, 不屈挠的, 顽固的 )]