Definition of unreadable
: not readable: such as
a
: not decipherable : illegible
unreadable handwriting
b
: impossible to read and understand : incomprehensible
… a flawed, unreadable, misleading bill that garnered support based on propaganda and clever—but false—talking points.— Marilyn M. Singleton
c
: impossible to interpret
The expression on her face was unreadable.
d
: not enjoyable or interesting enough to engage the reader
an unreadable novel
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Merriam-Webster unabridged
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Time Traveler for unreadable
The first known use of unreadable was circa 1655
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