reckless

Adjective

• characterized by careless unconcern
  • the heedless generosity and the spasmodic extravagance of persons used to large fortunes- Edith Wharton
    
  • reckless squandering of public funds
    

• marked by defiant disregard for danger or consequences
  • foolhardy enough to try to seize the gun from the hijacker
    
  • became the fiercest and most reckless of partisans-Macaulay
    
  • a reckless driver
    
  • a rash attempt to climb Mount Everest
    

Related words

• Synonyms: 
  heedless , foolhardy , heady , rash