adjective
an adjective is a word that describes or modifies a noun or pronoun. In this case, 'tolerable' describes something that is able to be endured or tolerated.
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The noise level in the library was just barely tolerable.
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I can only handle being around her for a short time, she's just tolerable.
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I find his jokes barely tolerable, they're so lame.
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The heat was so intense that it was barely tolerable, like being in an oven.