adjective
describing word that modifies a noun or pronoun, in this case meaning not blocked or obstructed
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The plumber unclogged the drain using a specialized tool.
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I finally unclogged the sink after pouring some drain cleaner down it.
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I had to use a wire hanger to unclog the toilet, it was a mess.
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After a good night's sleep, my mind felt unclogged and ready to tackle the day.