Find Synonyms
undeliverable Synonyms
Another word for undeliverable
Choosing another word for undeliverable depends on context, so the synonyms and similar words below are separated across 3 exact definitions and ranked by match strength.
• adjective (Context 1)
Unable to be delivered to the intended recipient, especially of mail, packages, or electronic messages due to an incorrect address or unavailable receiver.
Usage Example
"The postal service returned the letter to the sender because the missing apartment number made it unmailable."
Strong
unmailable
• adjective (Context 2)
Incapable of being fulfilled, produced, or provided as promised.
Usage Example
"Critics argued that the candidate's ambitious campaign pledges were financially unattainable."
Strong
unattainable
unachievable
unfeasible
unrealizable
impracticable
• noun (Context 3)
A piece of mail, parcel, or electronic message that cannot be delivered to its intended recipient.
Usage Example
"The mailroom clerk sorted through a bin of undeliverables to verify if any forwarding addresses were on file."
Strong
dead letter
Opposites of undeliverable
The opposite of undeliverable shifts depending on context. Common opposites include:
deliverable
achievable
feasible
attainable
• Nearby Words
Cite this Entry
Wordmom. (2026). Synonyms for Undeliverable. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/synonyms/undeliverable