DEADLETTER
Set to 2 different clues across 2 published puzzles, most often “It's undeliverable” — The New York Times, Wednesday, 6 April 2011.
10 letters
Every clue on record, most used first
- It's undeliverableonce
The New York Times — Wednesday, 6 April 2011
- Kind of officeonce
The New York Times — Wednesday, 27 November 2002