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The Clue

Hard (10 letter answer)

The Answer

ADAMANTINE

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Notes

The answer ADAMANTINE is so rare that it appears less than once every 2500 puzzles.

Definition

ADAMANTINE as an adjective:

1. consisting of or having the hardness of adamant
2. having the hardness of a diamond
3. (adamant, adamantine, inexorable, intransigent) = 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"