Synonyms for Masterful (same or very similar meaning)
WordNet sense 1 (having or revealing supreme mastery or skill):
consummate, masterly, virtuoso, consummateWordNet sense 2 (having or showing or requiring special skill):
skilledWordNet sense 3 (able to deal authoritatively with affairs):
imperiousWordNet sense 4 (tending to domineer):
domineeringFrom the ODE community, based on WordNetadd/edit