inflexible

Adjective

• incapable of adapting or changing to meet circumstances
  • a rigid disciplinarian
    
  • an inflexible law
    
  • an unbending will to dominate
    

• resistant to being bent;
  • an inflexible iron bar
    
  • an inflexible knife blade
    

• not making concessions
  • took an uncompromising stance in the peace talks
    
  • uncompromising honesty
    

• incapable of change
  • a man of inflexible purpose
    

Related words

• Synonyms: 
  rigid , unbending , uncompromising , sturdy
• Antonyms: 
  flexible , flexile , compromising , conciliatory