Merriam-Webster Collegiate Dictionary - dictatorial

 adjective  Date: 1701  1.  a. of, relating to, or befitting a dictator ~ power  b. ruled by a dictator  2. oppressive to or arrogantly overbearing toward others  • ~ly adverb  • ~ness noun Synonyms:  ~, magisterial, dogmatic, doctrinaire, oracular mean imposing one's will or opinions on others. ~ stresses autocratic, high-handed methods and a domineering manner exercised ~ control over the office. magisterial stresses assumption or use of prerogatives appropriate to a magistrate or schoolmaster in forcing acceptance of one's opinions the magisterial tone of his pronouncements. dogmatic implies being unduly and offensively positive in laying down principles and expressing opinions dogmatic about what is art and what is not. doctrinaire implies a disposition to follow abstract theories in framing laws or policies affecting people a doctrinaire approach to improving the economy. oracular implies the manner of one who delivers opinions in cryptic phrases or with pompous dogmatism a designer who is the oracular voice of fashion.