Peremptory

1. Precluding debate or expostulation; not admitting of question or appeal; positive; absolute; decisive; conclusive; final.
2. Positive in opinion or judgment; decided; dictatorial; dogmatical.
3. Firmly determined; unawed.
Peremptory challenge (Law)
See under Challenge.
Peremptory mandamus ,
a final and absolute mandamus.
Peremptory plea ,
a plea by a defendant tending to impeach the plaintiff's right of action; a plea in bar.