Synonyms of magisterial

2 Syllables
lordly, pompous
3 Syllables
tyrannic, out-of-line, insolent, judicial, imperial, wrong-headed, imperious, governing, dogmatic, dignified, juristic, puffed-up, highhanded, humorless, masterful
4 Syllables
egotistic, autocratic, dominating, domineering, presidential, juridical, departmental, doctrinaire, high-and-mighty, overbearing, legalistic, peremptory, governmental
5 Syllables
gubernatorial, authoritarian, jurisdictional