adjective
A word that describes or modifies a noun or pronoun. In this case, 'uncheerful' describes a lack of cheer or happiness.
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The atmosphere in the room was uncheerful as everyone sat in silence.
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I could tell by the uncheerful look on her face that something was wrong.
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His uncheerful attitude was bringing everyone down.
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The clouds hung low in the sky, casting an uncheerful shadow over the town.