Peremptory:

 

1 a : putting an end to or precluding a right of action, debate, or delay   ABSOLUTE, FINAL *a mathematician's conclusions ought to be peremptory and grounded in T infallible evidence Edward Reynolds*

2 a : expressive of urgency or command : IMPERATIVE

Webster’s Third New International Dictionary

 

Peremptory:

 

“Imperative; final; decisive; absolute; conclusive; positive; not admitting of question, delay, reconsideration or of any alternative. Self-determined; arbitrary; not requiring any cause to be shown.”
 

Source:  Black’s Law Dictionary