Addressee unknown Synonyms

We can't find synonyms for the phrase "Addressee unknown", but we have synonyms for terms, you can combine them.

Addressee Synonyms

Unknown Synonyms

AU abbreviation

AU is an abbreviation for Addressee Unknown

What does AU stand for?

AU stands for "Addressee Unknown"

Definitions for Addressee

(noun) one to whom something is addressed

Definitions for Unknown

(adjective) happening or existing without one's knowledge
(adjective) not known or experienced before
(adjective) not widely known