adjective
describing something that is not supported or maintained
adverb
modifying a verb, adjective, or other adverb to indicate time, manner, degree, or cause
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The evidence presented was unsustained and therefore deemed inadmissible in court.
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His argument was unsustained by any facts or proof.
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The rumor about her cheating on him was completely unsustained.
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The fragile relationship between the two countries remained unsustained despite efforts to improve it.