unsendable
adjEtymology From un- + sendable.
1
That cannot be sent.
- And Deianira, realizing that she has brought about Hercules' death, apparently breaks off her unsendable letter to him in order to express her despair […]1973, J W Binns, Ovid:
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.