behaving in a proud, superior way; (of behaviour etc) showing too much pride in oneself and too little thought for others

having exaggerated self-opinion

having or showing a great deal of confidence

aggressive

put forward as dogmas; (of a person, statement) expressing opinions in an arrogant way

dictatorial, opinionated

having strong control or authority; dominating

superior, controlling

of an empire or its ruler(s); magnificent

regal

showing too much pride in oneself, especially that one is superior to others

bossy, overbearing

of, conducted by, a magistrate; having or showing authority

authoritative

(of commands) not to be disobeyed or questioned; (of a person, manner) insisting (too much) on obedience

overbearing, authoritative

of, like, a tyrant

despotic, oppressive