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Untrue, not factual, factually incorrect.
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Based on factually incorrect premises.
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Spurious, artificial.
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(logic) Of a state in Boolean logic that indicates a negative result.
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Uttering falsehood; dishonest or deceitful.
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Not faithful or loyal, as to obligations, allegiance, vows, etc.; untrue; treacherous.
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Not well founded; not firm or trustworthy; erroneous.
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Not essential or permanent, as parts of a structure which are temporary or supplemental.
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Used in the vernacular name of a species (or group of species) together with the name of another species to which it is similar in appearance.
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(music) Out of tune.