unsubstantiate

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Verb

unsubstantiate (unsubstantiates, present participle unsubstantiating; past and past participle unsubstantiated)

1. To prove false; to disprove or discredit.
2. (human services) To officially categorize (an allegation) as unsubstantiated.
3. To call into question; to create doubt about.
4. To make insubstantial or abstract; unsubstantialize.

Adjective

unsubstantiate

1. Lacking substance; insubstantial.
2. Unsubstantiated; unproven.

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