permanent

Adjective

• not capable of being reversed or returned to the original condition
  • permanent brain damage
    

• continuing or enduring without marked change in status or condition or place
  • permanent secretary to the president
    
  • permanent address
    
  • literature of permanent value
    

Noun

• a series of waves in the hair made by applying heat and chemicals

Related words

• Synonyms: 
  lasting , permanent wave , perm
• Antonyms: 
  impermanent , temporary