Old English (as a noun), from Old French adamaunt-, via Latin from Greek, adamasadamant-untameable, invincible (later used to denote the hardest metal or stone, hence diamond), from a-not + damanto tame. The phrase to be adamantdates from the 1930s, although adjectival use had been implied in such collocations as ‘a(chǎn)n adamant heart’ since the 16th cent
英英釋義網(wǎng)絡(luò)釋義
noun
1.very hard native crystalline carbon valued as a gem
2.not capable of being swayed or diverted from a course; unsusceptible to persuasion;