imposing in WordNet English dictionary

1. impressive in appearance
   "a baronial mansion"; "an imposing residence"; "a noble tree"; "severe-looking policemen sat astride noble horses"; "stately columns"
   baronial  imposing  noble  stately 
   
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