单词：adamant 

名词

• 
  [1.n.adamant] (同义词:[diamond( n. 钻石, 菱形 )]  [adamant( adj. 坚硬的 )]  )
• 
  注释列句：very hard native crystalline carbon valued as a gem
• 上位词 -> [carbon( n. [化]碳(元素符号C), (一张)复写纸 )]  [chemical_element]  [substance( n. 物质, 实质, 主旨 )]  [matter( n. 事件, 问题, 物质, 内容, 实质, 原因, (印刷或书写的)文件, (文章或讲话等的)素材 vi. 有关系, 要紧 )]  [physical_entity]  [entity( n. 实体 )] 
• 下位词 -> [carbonado( n. 黑金刚石 )] 
  

形容词

• 
  [1.a.adamant] (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 )]  )
• 
  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 )] 
  派生词 -> [adamance]