Peremptory is a formal word used especially in legal contexts to describe an order, command, etc., that requires immediate compliance with no opportunity to show why one should not comply. It is also used disapprovingly to describe someone with an arrogant attitude, or something indicative of such an attitude.

// The soldiers were given a peremptory order to abandon the mission.

// The company’s president tends to adopt a peremptory manner especially at the negotiating table.

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“Cook had changed. He seemed restless and preoccupied. There was a peremptory tone, a raw edge in some of his dealings. Perhaps he had started to believe his own celebrity. Or perhaps, showing his age and the long toll of so many rough miles at sea, he had become less tolerant of the hardships and drudgeries of transoceanic sailing.” — Hampton Sides, The Wide Wide Sea: Imperial Ambition, First Contact and the Fateful Final Voyage of Captain James Cook, 2024

Peremptory comes from the Latin verb perimere, meaning “to take entirely” or “to destroy,” which in turn combines the prefix per- (“throughout” or “thoroughly”) and the verb emere (“to take”). Peremptory implies the removal of one’s option to disagree or contest something, and sometimes suggests an abrupt dictatorial manner combined with an unwillingness to tolerate disobedience or dissent, as in “employees given a peremptory dismissal.” Not to sound peremptory ourselves, but don’t confuse peremptory with the similar-sounding (and related) adjective preemptive, meaning “marked by the seizing of the initiative,” as in “a preemptive attack.”