adjective
a word that describes or modifies a noun, in this case, humorless describes someone who lacks a sense of humor
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The professor was known for being humorless and rarely cracked a smile during lectures.
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My boss is so humorless, he never laughs at any of our jokes in the office.
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She's so humorless, she wouldn't know a joke if it hit her in the face.
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The novel's protagonist was portrayed as humorless, unable to see the lighter side of life.