unknown
adjective
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being or having an unknown or unnamed source“a poem by an unknown author”nameless
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not known beforestrange
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not famous or acclaimedunsung
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not known“an unknown amount”
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not known to exist“things obscurely felt surged up from unknown depths”
noun
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a variable whose values are solutions of an equationunknown quantity
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an unknown and unexplored region“they came like angels out the unknown”unknown region
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anyone who does not belong in the environment in which they are foundalienstranger