an ignorant, foolish, or silly person.

1640–50; simple + -ton

dolt, fool, numskull, blockhead, ninny, dope. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
simpleton (ˈsɪmpəltən)
a foolish or ignorant person

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1650, jocular formation from simple and -ton, suffix extracted from surnames.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The plot featured three characters: a simpleton, a student and a sage, who
  debated the structure of the solar system.
There is a simpleton in making, people are angry and he has begun to lose their
  support and loyalty.
He was extremely intelligent, though he was certainly rather a simpleton at
Why does every simpleton need someone else to do their research.
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