noun
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that which is very difficult to accomplish.
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an incomprehensible subject, matter, secret, etc.; a mysterious thing.
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a great, wonderful thing.
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a deep ditch.
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a dense, impenetrable forest.
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a low, woody plant with several permanent stems; a bush; a shrub.
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a narrow and inaccessible place.
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the fact of being dense, crowded.
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a respectable man; a man of esteem.