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unaccounted-for

[ uhn-uh-koun-tid-fawr ]
/ ˌʌn əˈkaʊn tɪdˌfɔr /
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adjective
not accounted for; not understood; unexplained: an explosion resulting from some unaccounted-for mechanical failure.
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Origin of unaccounted-for

1790–1800; formed on the verb phrase account for;see un-1, -ed2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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