WordReference Random House Learner's Dictionary of American English © 2017
ad•a•mant /ˈædəmənt, -ˌmænt/USA pronunciation   adj. 
  1. unyielding;
    inflexible:an adamant refusal.[be + ~ (+ that clause)]He was adamant that he was in the right.
ad•a•mant•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2017
ad•a•mant  (adə mənt, -mant′),USA pronunciation adj. 
  1. utterly unyielding in attitude or opinion in spite of all appeals, urgings, etc.
  2. too hard to cut, break, or pierce.

n. 
  1. any impenetrably or unyieldingly hard substance.
  2. Jewelrya legendary stone of impenetrable hardness, formerly sometimes identified with the diamond.
ad•a•man•cy  (adə mən sē),USA pronunciation  ad′a•mance, n.  ada•mant•ly, adv. 
  • Latin
  • Vulgar Latin *adimant-
  • Middle French aimant
  • Medieval Latin) and Middle English aymont
  • Greek, equivalent. to a- a-6 + -damant- verbal adjective, adjectival of damân to tame, conquer; replacing Old English athamans (
  • Latin adamant- (stem of adamas) hard metal (perh. steel), diamond
  • Old French adamaunt
  • bef. 900; Middle English
    • 1.See corresponding entry in Unabridged inflexible, rigid, uncompromising.
    • 1.See corresponding entry in Unabridged flexible, easygoing, yielding.


Collins Concise English Dictionary © HarperCollins Publishers::

adamant /ˈædəmənt/ adj
  1. unshakable in purpose, determination, or opinion; unyielding
n
  1. any extremely hard or apparently unbreakable substance
  2. a legendary stone said to be impenetrable, often identified with the diamond or loadstone
Etymology: Old English: from Latin adamant-, stem of adamas, from Greek; literal meaning perhaps: unconquerable, from a-1 + daman to tame, conquer



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