Merriam-Webster Collegiate Dictionary - peremptory

 adjective  Etymology: Middle English peremptorie, from Anglo-French, from Late Latin & Latin; Late Latin peremptorius, from Latin, destructive, from perimere to take entirely, destroy, from per- thoroughly + emere to take — more at redeem  Date: 15th century  1.  a. putting an end to or precluding a right of action, debate, or delay; specifically not providing an opportunity to show cause why one should not comply a ~ mandamus  b. admitting of no contradiction  2. expressive of urgency or command a ~ call  3.  a. characterized by often imperious or arrogant self-assurance how insolent of late he is become, how proud, how ~ — Shakespeare  b. indicative of a ~ attitude or nature ; haughty a ~ tone ~ disregard of an objection  Synonyms: see masterful  • peremptorily adverb  • peremptoriness noun