simpleton

[ sim-puhl-tuhn ]
/ ˈsɪm pəl tən /

noun

an ignorant, foolish, or silly person.

Origin of simpleton

First recorded in 1640–50; simple + -ton
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for simpleton

simpleton

/ (ˈsɪmpəltən) /

noun

a foolish or ignorant person
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012