noun
a person, place, thing, or idea
adjective
describing word that modifies a noun or pronoun
adverb
describing word that modifies a verb, adjective, or another adverb
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The scientist was puzzled by the presence of an unknown unknown in their research findings.
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I have no idea what I'm supposed to do with this unknown unknown situation.
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I'm totally lost when it comes to dealing with these unknown unknowns.
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Sometimes life throws us curveballs in the form of unknown unknowns.