peremptory
(law) Precluding debate or expostulation; not admitting of question or appeal
(law) (of a date or deadline) Absolutely requiring compliance or attendance; brooking no further delay; to proceed whether a party attends or not; final.
Positive in opinion or judgment; absolutely certain, overconfident, unwilling to hear any debate or argument (especially in a pejorative sense); dogmatic.
(obsolete) Firmly determined, resolute; obstinate, stubborn.
Accepting no refusal or disagreement; imperious, dictatorial.
My friend had the piece returned from the management with a particularly polite but equally peremptory rejection.
(law) A challenge to the admission of a juror, without the challenger needing to show good cause.