כְּסִיל (kᵉçîylkes-eel'noun|masculinestupid 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).