adjective
a word that describes or modifies a noun or pronoun, in this case 'uptight' describes someone who is tense or anxious
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The uptight atmosphere in the office made it difficult for employees to relax.
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Don't be so uptight, just go with the flow.
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Why are you so uptight about everything? Chill out.
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Her uptight demeanor was like a tightly wound spring, ready to snap at any moment.