simpleton
simp·le·ton
noun
1.
a person lacking intelligence or common sense
Origin
From simple + -ton (as in a surname). Compare French simplet, Italian semplicione.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.