adamant

Noun
  1. Very hard native crystalline carbon valued as a gem (synset 114858733)
    is a type of:
    • atomic number 6, c, carbon - an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
    • transparent gem - a gemstone having the property of transmitting light without serious diffusion
    subtypes: black diamond, carbonado - an inferior dark diamond used in industry for drilling and polishing
    same as: diamond
Adjective
  1. Impervious to pleas, persuasion, requests, reason (synset 301028427)
    "he is adamant in his refusal to change his mind"; "Cynthia was inexorable; she would have none of him"; "an intransigent conservative opposed to every liberal tendency"
    similar to: inflexible - incapable of change
    same as: adamantine, inexorable, intransigent

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