כְּסִיל‎ (kᵉçîyl|kes-eel'|noun|masculine|stupid fellow)
[Heb] כְּסִיל‎ ETCBC: כְּסִיל‎ (adjv|insolent) OSHL: k.cj.ad TWOT: 1011c GK: H4067
Derivation: from כָּסַל‎;
Strong's: properly, fat, i.e. (figuratively) stupid or silly
KJV: fool(-ish).