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, adamantine, inexorable • Similar to: inflexible • Derivationally related forms: intransigency, intransigence, inexorableness (for: inexorable), adamance (for: adamant)