כְּסִיל m. (b. h.) 1) (a denom. of כֶּסֶל q. v.) [one with thick loins, stout,] (cmp. טִפֵּשׁ) fool, foolish, overbearing. Y. Peah I, 15ᵇ bot.; Yalk. Ex. 415 (ref. to Prov. III, 26) דברים שאתה כ׳ בהם וכ׳ in things in which thou art foolish (ignorant), He will guard thy foot &c.—Pl. כְּסִילִים. Num. R. s. 16 (ref. to Prov. XXVI, 6) עשו עצמן כ׳ they (the spies) made fools of themselves. —2) K’sil, the constellation Orion (v. Winer, Reallex. s. v. Nimrod). Ber. 58ᵇ