Adamant
WordNet
adjective
(1) Impervious to pleas, persuasion, requests, reason
"He is adamant in his refusal to change his mind"
"Cynthia was inexorable; she would have none of him"- W.Churchill
"An intransigent conservative opposed to every liberal tendency"
noun
(2) Very hard native crystalline carbon valued as a gem
WiktionaryText
Etymology
From , accusative singular form of < < + .
Adjective
- resistant to reason; determined; inflexible; unshakeable; unyielding
Noun
- a rock or mineral held by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardness
- an embodiment of impregnable hardness
- lodestone; magnet
Quotations
- 1956 — Arthur C. Clarke, The City and the Stars, p 34
- Unprotected matter, however adamant, would have been ground to dust ages ago.