The word for today is…
adamant (adjective, noun) -
adjective
: unshakable or insistent especially in maintaining a position or opinion : unyielding
noun
1: a stone (such as a diamond) formerly believed to be of impenetrable hardness
2: an unbreakable or extremely hard substance
Source : Merriam-Webster
Etymology : A person who is adamant about something has formed an opinion or taken a position that is not going to change because the person is determined to keep that opinion or position. If you're adamant about a decision you've made, no one can convince you that it was a mistake. If you're adamant that something be done (or not be done), you insist that it be (or not be) so.
The adjective dates to the early 1800s but it comes from a much older—and now much less common—noun. An adamant is an imaginary stone of impenetrable hardness. Historically, the word applied to actual stones (and other substances) believed to be impenetrable; in the 17th century the word was used as a synonym of diamond. The noun adamant comes from a Latin word meaning "material of extreme hardness, diamond."
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