magisterial in WordNet English dictionary

1. 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"
   autocratic  bossy  dominating  high-and-mighty  magisterial  peremptory 
   
2. used of a person's appearance or behavior; befitting an eminent person
   "his distinguished bearing"; "the monarch's imposing presence"; "she reigned in magisterial beauty"
   distinguished  grand  imposing  magisterial 
   
3. of or relating to a magistrate
   "official magisterial functions"
   magisterial