unacknowledged letter , also: unanswered letter

In the military and civil branch the backlog of unanswered letters used to be 15 to 30; now it is 115 to 130.

Some Council members said the array of unanswered letters confirmed fears that the Mayor's moves to reduce government may be hurting city services.

I didn't know that he had been writing years of unanswered letters to China.

Never an unfiled paper or an unanswered letter.

All Franny's unanswered letters finally deserved an answer.

"I left a pile of unanswered letters on the desk," she wrote.

The basket is overloaded and separate stacks of unanswered letters lie in piles next to the wooden tray.

Some bring with them only a first name or a photograph, others an address and a history of unanswered letters.

For example, they have replied to unanswered letters, made payments that are due and reversed previous unfavourable decisions.

Its distinctive hinged lid provides an ideal way to hide unanswered letters or unpaid bills.