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adamant

ad·a·mant [ áddəmənt, áddə mànt ]


adjective 
Definition:
 
set in opinion: very determined and not influenced by appeals to reconsider a position or decision



noun 
Definition:
 
legendary stone: a legendary, extremely hard stone, sometimes identified as diamond or lodestone ( archaic )

[Pre-12th century. Via Old French adamaunt and Latin adamant- "adamant, steel, diamond" < Greek adamas "unbreakable" < daman "break down"]

ad·a·mant·ly adverb
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