adjective
An adjective is a word that describes or modifies a noun or pronoun. In this case, 'unimpressive' describes something that does not make a strong or favorable impact.
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The candidate's performance during the interview was unimpressive.
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The movie we saw last night was pretty unimpressive.
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That new restaurant everyone is talking about? It's totally unimpressive.
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His attempt to impress her with his cooking skills was unimpressive at best.