unpardonable

Meanings

1. 1
   adj

   so wrong, offensive, or harmful that it cannot be forgiven or excused

   Ignoring the safety warning was an unpardonable failure of judgment.

Formed from un- ('not') + pardonable. Pardon entered English through Old French pardoner, ultimately from Medieval Latin perdonare, 'to grant fully'; unpardonable therefore describes what cannot be granted pardon or accepted as excusable.

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