peremptory

Precluding debate or expostulation; not admitting of question or appeal.

• there is no reason but if any of the outlawries be indeed without error, but it should be a peremptory plea to the person in a writ of error, as well as in any other action.

Of a date or deadline, absolutely requiring compliance or attendance; brooking no further delay; proceeding whether a party attends or not; final.

• As this trial has now been postponed multiple times, there will be an adjournment to April 24, peremptory on the parties.

Positive in opinion or judgment; absolutely certain, overconfident, unwilling to hear any debate or argument (especially in a pejorative sense); dogmatic.

• He marched under a placard reading "End Bossiness Now" but decided it was a little too peremptory, not quite British, so changed the slogan on subsequent badges, to "End Bossiness Soon."

Firmly determined, resolute; obstinate, stubborn.obsolete

Accepting no refusal or disagreement; imperious, dictatorial.

• […] less surprising than that he had been depressed by a book. Something was making him nibble at the edge of stale ideas as if his sturdy physical egotism no longer nourished his peremptory heart.

A challenge to the admission of a juror, without the challenger needing to show good cause.

• Each side was allowed 20 peremptories, and the prosecution used 18 of its allotment.