SINCE 1828

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un-understandable

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

in the meaning defined above

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