A stone imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness; but in modern mineralogy it has no technical signification
If someone is adamant about something, they are determined not to change their mind about it. The prime minister is adamant that he will not resign Sue was adamant about that job in Australia. + adamantly ada·mant·ly She was adamantly opposed to her husband travelling to Brussels. determined not to change your opinion or a decision that you have made (adamas , from )
a rock or mineral imagined by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness