- (informal or nonstandard) superlative form of : most curious
- 1593, Sidney, Sir Philip, “Book V”, in The Countesse of Pembrokes Arcadia, expanded edition, page 193:
- Honourable even in the curiousest pointes of honour, whereout there can no disgrace nor disperagement come unto her.
- 1852, Gregory, Sir William Henry, A Transport Voyage to the Mauritius and Back, Paris: A. and W. Galignani and Company, page 22:
- "But the curiousest thing a'most as I ever see at sea," resumed the mate ....
- What was the curiousest thing he had seen? Well! He didn't know. He couldn't momently name what was the curiousest thing he had seen, — unless it was a Unicorn, — and he see him once at a Fair.