Crossword clues for the word: DEADLETTER The word DEADLETTER has appeared as an answer to at least 10 crossword clues on different crossword puzzles. Crossword clues for DEADLETTER Showing 1 to 10 of 10 results Clue(s) *Undeliverable bit of mail A communication from the spirit world? Flat landlord no longer observed legal requirements Ineffectual law from the beginning of 11 across and 8 across It's undeliverable Law no longer enforced. Law still in effect but no longer enforced One that's passed over in the sorting office? One with nothing vital to communicate? Postal item not delivered late?