The Hebrew word sakal means to act foolishly or to be a fool — one who acts without understanding, failing to reckon with God's ways and the nature of reality. It denotes not mere intellectual failure but moral and spiritual blindness.
Sakal in the Old Testament is not about IQ — it is about orientation. The sakal fool is the person who fails to factor God into their calculations and decision-making. When Saul confessed 'I have played the fool (sakal) and erred exceedingly' (1 Samuel 26:21), he acknowledged a failure of wisdom rooted in disobedience and self-trust. Ecclesiastes uses sakal to describe the painful futility of a life spent laboring for gain that one must leave to someone else (2:19). The corrective for sakal is not information but the fear of the LORD — the foundation of all true wisdom (Proverbs 9:10).