Wiktionary
a. 1 Not posted; unsent, unmailed. 2 Not assigned to a military post.
Usage examples of "unposted".
I stand, so to speak, with an unposted letter bearing the extra regulation fee before the too late box of the general postoffice of human life.
The camp would have two posted guards and one unposted one, for the barbarian and half-elf would keep surreptitious watch themselves.
Falling foul of such an unposted hazard would be all the more regrettable, pitiful or even tragic, because the suffering arising from it is needless, and yet, this is simply our lot in life.
In return she handed you the fatal letter disguised as an unposted letter of her own.
A few days later the announcement of his approaching marriage reached Garthowen, in a letter from Will himself, enclosing the unposted missive, which he had discovered in his pocket as he drove to Nantmyny on the previous Sunday.
The place was unmapped and unposted, traversed more by instinct than any real sense of direction.
INTERVIEW ON the following morning, Clyde Burke entered his office to find an unposted letter in the mail box.
Harriet could sit down in the afternoon to write an account of the inquest and add it to the piles of unposted letters to Peter.
She recognized the unposted envelope as Barrington note-paper and realized it must be the letter she saw him writing on that Sunday evening Saluby had been here.
She wondered if she ought to steam open the unposted letter that she knew for certain Nicholas had written himself, and then considered the microscope and the care with which Nicholas was watching this affair and decided that it was too risky.