high-and-mighty

Adjective

• offensively self-assured or given to exercising usually unwarranted power
  • an autocratic person
    
  • autocratic behavior
    
  • a bossy way of ordering others around
    
  • a rather aggressive and dominating character
    
  • managed the employees in an aloof magisterial way
    
  • a swaggering peremptory manner
    

Related words

• Synonyms: 
  autocratic , bossy , dominating , magisterial , peremptory