כָּסַל (kâçalkaw-sal'verbbe stupid)
[Heb] כָּסַל ETCBC: כסל‎ (verb|be insolent) OSHL: k.cj.aa TWOT: 1011 GK: H4071
Derivation: a primitive root;
Strong's: properly, to be fat, i.e. (figuratively) silly
KJV: be foolish.