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unknown | not known | |
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unknown | not known to exist | |
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unknown, unknown quantity | a variable whose values are solutions of an equation | |
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unknown, nameless, unidentified, unnamed | being or having an unknown or unnamed source | |
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unsung, unknown, obscure | not famous or acclaimed | |
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stranger, unknown, alien | anyone who does not belong in the environment in which they are found | |
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strange, unknown | not known before | |
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unknown, unknown region, terra incognita | an unknown and unexplored region |