dead mail deadly sin • deadman · · · Info · Definitions · Synonyms · Characters · · dead mail · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) mail that can neither be delivered nor returned. Synonyms: dead letter, dead mail. · · Noun Definition 1 Synonyms · · · dead letter · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D