adamantine

详细解释:a. 非常坚硬的, 坚定不移的
n. 金刚硼
【医】 釉质的

英语解释：

形容词 adamantine:

consisting of or having the hardness of adamanthaving the hardness of a diamondimpervious to pleas, persuasion, requests, reason同义词：adamant, inexorable, intransigent