autocratic, bossy, dominating, high-and-mighty, magisterial, peremptory

offensively self-assured or given to exercising usually unwarranted power; "an autocratic person"; "autocratic behavior"; "a bossy way of ordering others around"; "a rather aggressive and dominating character"; "managed the employees in an aloof magisterial way"; "a swaggering peremptory manner"

• domineering — tending to domineer