noun
a person who is easily deceived or tricked
verb
to deceive or trick someone into believing something that is not true
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It is not ethical to play someone for a fool in a professional setting.
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Don't think you can play me for a fool and get away with it.
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She thought she could play him for a fool, but he caught on quickly.
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Trying to deceive him was like trying to play a seasoned detective for a fool.