adj.not dispatched or transmitted

"the letter remained unwritten and unsent"

Unsent Letters:
Secure unsent message storage pending server connection
Unsent Letters: A Technique and Exercise in Social Work Supervision
Overcharging prevention by unsent downlink data volume record
Incomplete Correspondence: An Unsent Letter to Mary Joe Frug
Splitting in unsent letters: Writing as a social practice and a psychological activity
OVERCHARGING PREVENTION BY UNSENT DOWNLINK DATA VOLUME RECORD TECHNICAL FIELD
President Roosevelt, Admiral Stark, and the Unsent Warning to Pearl Harbor: A Research Note
Sytem for searching unseen messages in a mail inbasket while an unsent mail distribution is composed and presenting sender with diff...
Sytem for searching unseen messages in a mail inbasket while an unsent mail distribution is composed and presenting sender with diff...