simpleton

noun
🔊/ˈsɪmpltən/
🔊/ˈsɪmpltən/
(old-fashioned)
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  1. a person who is not very intelligent and can be tricked easily傻瓜;易上当受骗的人Topics Personal qualitiesc2
    Word Originmid 17th cent.: from simple, on the pattern of surnames derived from place names ending in -ton.