1. utterly unyielding in attitude or opinion in spite of all appeals, urgings, etc.
2. too hard to cut, break, or pierce. noun
3. any impenetrably or unyieldingly hard substance.
4. a legendary stone of impenetrable hardness, formerly sometimes identified with the diamond.
"people can be adamant about things."
"administrations can be adamant on things."
"people can be adamant in things."
"people can be adamant about ties."
"strings can be adamant on actions."
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