solitary
adjective
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being the only onesole
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devoid of creatureslonely
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characterized by or preferring solitudelonelonely
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lacking companions or companionshipalone
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of plants and animalsnongregariousnonsocial
noun
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one who lives in solitudereclusehermitsolitudinarian
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confinement of a prisoner in isolation from other prisoners“I was held in solitary for six months.”solitary confinement