indefinable

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ill-defined

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indeterminable

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indefinite

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unknowable

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unsayable

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inexpressible

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definable

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undefined

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incomprehensible

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undecidable

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imponderable

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unmeasurable

adj 0.665

indecipherable

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ungraspable

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unknown

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undecipherable

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illimitable

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ineffable

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intangible

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formless

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