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un–understandable

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adjective un–un·der·stand·able \ˌən-ˌən-dər-ˈstan-də-bəl\

variants: or

ununderstandable

Definition of un–understandable

: impossible to understand : not understandable Karl Jaspers held, famously, that schizophrenic phenomena are ununderstandable. — Naomi Eilan

First Known Use of un–understandable

circa 1631

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