adjective
adjective describes a noun or pronoun, in this case, 'knavish' describes someone who is dishonest or deceitful
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The knavish man was caught stealing from the store.
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That knavish guy is always up to no good.
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I don't trust that knavish fella, he gives me bad vibes.
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Her smile was as knavish as a fox's, hiding her true intentions.