1) to be foolish, be a fool 1a) (Piel) to make foolish, turn into foolishness 1b) (Niphal) to act or do foolishly 1c) (Hiphil) to do foolishly, play the fool Part of Speech: verb A Related Word by BDB/Strong’s Number: for H3688 Same Word by TWOT Number: 1493
Brown-Driver-Briggs
[סָכַל] verbbe foolish, or a fool, usually in moral or spititual sense (Syriac Aph`el act foolishly; foolish, etc., ᵑ7סְכַל derived species, act foolishly; סַכְלָאfool; Christian-Palestinian Aramaic , Aph`el=ἁμαρτάνω, also derivatives SchwIdioticon 62; Assyrian saklu, perhaps foolish, DlHWB 498; Aramaic סְכַלknow, be intelligent, cause to understand, etc. (derived species), compare שׂכל; MeiChrest. Targ. derives both these opposite meanings from Arabic form, likeness. Gerber178 thinks Hebrew verb denominative); —
PielImperfectיְסַכֵּלIsaiah 44:25, Imperativeסַכֶּלנָֿא2 Samuel 15:31, make foolish, turn into foolishness.
Genesis 31:28 HEB:וְלִבְנֹתָ֑י עַתָּ֖ה הִסְכַּ֥לְתָּֽ עֲשֽׂוֹ׃ NAS: Now you have done foolishly. KJV: and my daughters? thou hast now done foolishly in [so] doing. INT: first henceforth foolishly in doing
1 Samuel 13:13 HEB:אֶל־ שָׁא֖וּל נִסְכָּ֑לְתָּ לֹ֣א שָׁמַ֗רְתָּ NAS: to Saul, You have acted foolishly; you have not kept KJV: to Saul, Thou hast done foolishly: thou hast not kept INT: over to Saul have acted have not kept
1 Samuel 26:21 HEB:הַזֶּ֑ה הִנֵּ֥ה הִסְכַּ֛לְתִּי וָאֶשְׁגֶּ֖ה הַרְבֵּ֥ה NAS: Behold, I have played the fool and have committed KJV: this day: behold, I have played the fool, and have erred INT: this Behold have played committed abundance
2 Samuel 15:31 HEB:וַיֹּ֣אמֶר דָּוִ֔ד סַכֶּל־ נָ֛א אֶת־ NAS: I pray, make the counsel KJV: of Ahithophel into foolishness. INT: said and David make pray the counsel
2 Samuel 24:10 HEB:עַבְדְּךָ֔ כִּ֥י נִסְכַּ֖לְתִּי מְאֹֽד׃ NAS: of Your servant, for I have acted very KJV: for I have done very foolishly. INT: of your servant for have acted very
1 Chronicles 21:8 HEB:עַבְדְּךָ֔ כִּ֥י נִסְכַּ֖לְתִּי מְאֹֽד׃ פ NAS: of Your servant, for I have done very KJV: for I have done very foolishly. INT: of your servant for have done very
2 Chronicles 16:9 HEB:שָׁלֵ֛ם אֵלָ֖יו נִסְכַּ֣לְתָּ עַל־ זֹ֑את NAS: is completely His. You have acted foolishly in this. KJV: [is] perfect toward him. Herein thou hast done foolishly: therefore from henceforth INT: is completely about have acted and likewise
Isaiah 44:25 HEB:אָח֖וֹר וְדַעְתָּ֥ם יְשַׂכֵּֽל׃ NAS: their knowledge into foolishness, KJV: and maketh their knowledge foolish; INT: back their knowledge foolishness
Aph`el act foolishly; 
foolish, etc., ᵑ7סְכַל derived species, act foolishly; סַכְלָאfool; Christian-Palestinian Aramaic 
, Aph`el=ἁμαρτάνω, also derivatives SchwIdioticon 62; Assyrian saklu, perhaps foolish, DlHWB 498; Aramaic 
סְכַלknow, be intelligent, cause to understand, etc. (derived species), compare שׂכל; MeiChrest. Targ. derives both these opposite meanings from Arabic 
form, likeness. Gerber178 thinks Hebrew verb denominative); —