Synonyms of 'unaccounted for'
missingDictionary, lost, mislaid
If something is missing, it is not in its usual place, and you cannot find it.
About £50 million from the robbery is still unaccounted for.
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Thesaurus for unaccounted for from the Collins English Thesaurus
If people or things are unaccounted for , you do not know where they are or what has happened to them.