FROM STRONG’S HEBREW DICTIONARY (1890)

Strong’s Hebrew Dictionary (1890) — public domain, printed whole.

kecel keh'-sel — from 3688; properly, fatness, i.e. by implication (literally) the loin (as the seat of the leaf fat) or (generally) the viscera; also (figuratively) silliness or (in a good sense) trust:--confidence, flank, folly, hope, loin.

see HEBREW for 03688