From un- + exampled.
unexampled (not comparable)
- Lacking prior examples; unprecedented.
- 1897, Henry James, What Maisie Knew:
- Shortly after this Mrs. Wix looked so ill that it was to be feared her ladyship had treated her to some unexampled passage.
- 1924, Herman Melville, Billy Budd, London: Constable & Co., Chapter 7, 
- At the height of Napoleon's unexampled conquests […]