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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
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Time Traveler for un-understandable
The first known use of un-understandable was circa 1631
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