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Common words appear frequently in written and spoken language across many genres from radio to academic journals.
Informal words should be reserved for casual, colloquial communication.
noun unexplored, unoccupied area of land

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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adj in disguise

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun something kept hidden, unrevealed

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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adj secret

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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adj unfamiliar with

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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noun next world
adj unsung

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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adj not named

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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adj not determined

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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adj unfound

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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