1. consisting of or having the hardness of adamant • Pertains to noun: adamant 2. having the hardness of a diamond • Similar to: hard 3. 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 • Syn: adamant, inexorable, intransigent • Similar to: inflexible • Derivationally related forms: intransigency (for: intransigent), intransigence (for: intransigent), inexorableness (for: inexorable), adamance (for: adamant)