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undeliverable

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adjective un·de·liv·er·able \ˌən-di-ˈli-v(ə-)rə-bəl, -dē-\

Definition of undeliverable

: not capable of being delivered : not deliverable undeliverable mail/e-mail an undeliverable parcel a message returned as undeliverable

undeliverability

play \ˌən-di-ˌli-v(ə-)rə-ˈbi-lə-tē, -dē-\ noun

First Known Use of undeliverable

1843

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