peremptory
     adj 1: 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" [syn: {autocratic}, {bossy},
             {dominating}, {high-and-mighty}, {magisterial}]
     2: not allowing contradiction or refusal; "spoke in peremptory
        tones"; "peremptory commands"
     3: putting an end to all debate or action; "a peremptory
        decree"
Source: WordNet® 2.0