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Gullible
Easily Deceived
Gullible people accept things easily without proof, showing their innocence or naivety in trusting others. 
Negative Implication
Saying someone is gullible often implies that they lack judgment or intelligence, which can be offensive. 
Often in Jokes
The word 'gullible' is commonly used in jokes or pranks where someone is tricked in a light-hearted manner. 