steadfast

Adjective

• firm and dependable especially in loyalty
  • a steadfast ally
    
  • a staunch defender of free speech
    
  • unswerving devotion
    
  • unswerving allegiance
    

• marked by firm determination or resolution; not shakable
  • firm convictions
    
  • a firm mouth
    
  • steadfast resolve
    
  • a man of unbendable perseverence
    
  • unwavering loyalty
    

Related words

• Synonyms: 
  staunch , unswerving , firm , steady , stiff , unbendable , unfaltering , unshakable , unwavering