Definitions from Wiktionary (unknown unknown)
▸ noun: An uncertainty of unknown magnitude, consequence, structure, and probability characteristics, possibly with completely unsuspected existence; something that we don't know that we don't know.
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▸ noun: An uncertainty of unknown magnitude, consequence, structure, and probability characteristics, possibly with completely unsuspected existence; something that we don't know that we don't know.
Similar:
known unknown,
unk-unk,
as-yet-unknown,
unknown quantity,
unknowable,
unknown number,
indeterminable,
don't know,
uncertain,
unpredictable,
more...
Opposite:
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