inexorable

Adjective

• impervious to pleas, persuasion, requests, reason; she would have none of him"- W.Churchill
  • he is adamant in his refusal to change his mind
    
  • Cynthia was inexorable
    
  • an intransigent conservative opposed to every liberal tendency
    

• not to be placated or appeased or moved by entreaty
  • grim determination
    
  • grim necessity
    
  • Russia's final hour, it seemed, approached with inexorable certainty
    
  • relentless persecution
    
  • the stern demands of parenthood
    

Related words

• Synonyms: 
  adamant , adamantine , intransigent , grim , relentless , stern , unappeasable , unforgiving , unrelenting