adamantine
[ ad-uh-man-teen ]
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Part of Speech adjective
Origin + Etymology
Old English borrowed from the French adamant "diamond," and the Latin adamantem "hardest iron, steel"
Synonyms
    1.
  • adamant
  • hardheaded
  • stubborn
    2.
  • unbreakable
Antonyms
    1.
  • flexible
  • open-minded
    2.
  • fragile
Definition
1. utterly unyielding or firm in attitude or opinion
2. too hard to cut, break, or pierce
Examples
1. A) She was adamantine in her beliefs, which made discussing politics an exercise in futility. B) People have surprisingly adamantine thoughts about what does or does not constitute a sandwich.
2. A) Given the reinforced steel, I'd say the door is practically adamantine. B) The search for an adamantine weapon makes up a good number of fantasy stories.
Usage Over Time

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