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כָּסַל

From LSJ

Κακοῦ μεταβολὴν ἀνδρὸς οὐ δεῖ προσδοκᾶν → Non exspectandus improbi flexus viri → Auf Wandel eines schlechten Mannes warte nicht

Menander, Monostichoi, 282

English (Strong)

a primitive root; properly, to be fat, i.e. (figuratively) silly: be foolish.