peremptory
1. [ adjective ] offensively self-assured or given to exercising usually unwarranted power
Synonyms: bossy dominating high-and-mighty magisterial autocratic
Examples:

"an autocratic person" "autocratic behavior" "a bossy way of ordering others around" "a rather aggressive and dominating character" "a swaggering peremptory manner"

Related terms: domineering
2. [ adjective ] not allowing contradiction or refusal
Synonyms: commanding
Examples:

"spoke in commanding (or peremptory) tones" "peremptory commands"

Related terms: imperative
3. [ adjective ] putting an end to all debate or action
Examples:

"a peremptory decree"

Related terms: decisive
Similar spelling:   peremptorily
  preemptor
  pre-emptor