adamantine

Something adamantine is unbreakable. Adamantine is often used in a figurative way. If you’re bound by adamantine chains, get comfy because you’re not breaking free!

When someone is adamant, she won't budge or yield. Anything adamantine is pretty much unbreakable and invulnerable. Adamantine substances also tend to be bright and shiny like diamonds. When used figuratively, adamantine can describe something unbreakable, like the adamantine will of a marathon runner.

Definitions of adamantine
  1. adjective
    consisting of or having the hardness of adamant
  2. adjective
    having the hardness of a diamond
    Synonyms:
    hard
    resisting weight or pressure
  3. adjective
    impervious to pleas, persuasion, requests, reason
    synonyms: adamant, inexorable, intransigent
    inflexible
    incapable of change
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