adamant

American  

[ad-uh-muhnt, -mant] / ˈæd ə mənt, -ˌmænt /

adjective

1. utterly unyielding in attitude or opinion in spite of all appeals, urgings, etc.

   Synonyms:

   uncompromising, rigid, inflexible

   Antonyms:

   yielding, easygoing, flexible

2. too hard to cut, break, or pierce.

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noun

1. any impenetrably or unyieldingly hard substance.

2. a legendary stone of impenetrable hardness, formerly sometimes identified with the diamond.

adamant British  

/ ˈædəmənt /

adjective

1. unshakable in purpose, determination, or opinion; unyielding

2. a less common word for adamantine

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noun

1. any extremely hard or apparently unbreakable substance

2. a legendary stone said to be impenetrable, often identified with the diamond or loadstone

Other Word Forms

• adamance noun
• adamancy noun
• adamantly adverb
• unadamant adjective

Etymology

Origin of adamant

First recorded before 900; Middle English, from Old French adamaunt, from Latin adamant- (stem of adamas ) “hard metal (perhaps steel), diamond,” from Greek, equivalent to a- a- ⁶ + -damant- verbal adjective of damân “to tame, conquer”; replacing Old English athamans (from Medieval Latin ) and Middle English aymont, from Middle French aimant, from unattested Vulgar Latin adimant-, from Latin

Explanation

If you stubbornly refuse to change your mind about something, you are adamant about it. This word's story begins in ancient Greece, where philosophers spoke about a legendary unbreakable stone or metal they called adamas (literally, "invincible"). In English, people began to use the word to refer to something that cannot be altered, and then in the twentieth century — after adamant had been in English for about a thousand years — it came to be used as an adjective to mean "unyielding as stone." If you're adamant about something, no amount of persuasion is going to convince you otherwise.

Example Sentences

Isaac was adamant that humans must be in the mix, telling me that exploration was part of human DNA.

From BBC • Apr. 11, 2026

Did he believe that adamant denials would allow him to brazen his way through?

From Los Angeles Times • Apr. 10, 2026

They are, Mr. Wooldridge writes, wedded to three adamant ideas.

From The Wall Street Journal • Apr. 10, 2026

Pineiro's camp have been adamant she will shock the Cardiff crowd.

From BBC • Apr. 3, 2026

At midnight in the adamant tower, Lord Asriel sat in discussion with King Ogunwe, the angel Xaphania, Madame Oxentiel the Gallivespian, and Teukros Basilides.

From "The Amber Spyglass" by Philip Pullman

Related Words

• determined
• insistent
• intransigent
• resolute
• rigid
• stubborn
• uncompromising