Properly, fat , i.e. (figuratively) stupid or silly
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The Hebrew term kesil describes a person whose conduct shows moral and practical folly, especially resistance to knowledge, correction, restraint, and wisdom. Proverbs portrays the kesil as hating knowledge, airing opinions without delighting in understanding, speaking destructively, trusting self, and refusing to turn from evil.
Reader summary
Full entry for כְּסִיל (H3684) · Open the biblical lexicon
The Hebrew term kesil describes a person whose conduct shows moral and practical folly, especially resistance to knowledge, correction, restraint, and wisdom. Proverbs portrays the kesil as hating knowledge, airing opinions without delighting in understanding, speaking destructively, trusting self, and refusing to turn from evil.
The BSB source-word alignment has 70 aligned rows for this entry. Common renderings include of a fool (10), of fools (10), a fool (9), The fool (5), but a foolish (4).
The source-word alignment first shows this entry at Psalms 49:10. Its strongest book concentrations include Proverbs (49), Ecclesiastes (18), Psalms (3).
The Hebrew term kesil describes a person whose conduct shows moral and practical folly, especially resistance to knowledge, correction, restraint, and wisdom. Proverbs portrays the kesil as hating knowledge, airing opinions without delighting in understanding, speaking destructively, trusting self, and refusing to turn from evil. Yet wisdom addresses fools with an invitation to gain understanding, showing that the category exposes a path rather than declaring a person subhuman or beyond change.
Ecclesiastes can call a king foolish because he no longer receives warning, placing power and teachability together. The term is not a diagnosis of intelligence, disability, education, neurodivergence, mental illness, or cultural difference. Responsible teaching names the specific behavior a passage condemns and applies the warning first to the hearer, including leaders and teachers.
It must not become a slur for opponents, children, people who ask questions, or those who process information differently. Wisdom seeks repentance, careful speech, teachability, and safe boundaries where persistent reckless conduct harms others.
Kesil is a wisdom category for entrenched moral and practical folly shown through rejected knowledge, reckless confidence, destructive speech, and resistance to warning. Its contrasts call readers toward understanding and teachability rather than authorizing contemptuous labeling.
“How long, O simple ones, will you love your simple ways? How long will scoffers delight in their scorn and fools hate knowledge?
Wisdom confronts fools who hate knowledge while continuing to call the unwise to change.
O simple ones, learn to be shrewd; O fools, gain understanding.
Wisdom directly invites fools to gain understanding, so folly is not presented as hopeless destiny.
He who walks with the wise will become wise, but the companion of fools will be destroyed.
Companionship shapes moral direction, contrasting growing wisdom with the destructive effect of foolish company.
A fool does not delight in understanding, but only in airing his opinions.
The fool prefers displaying personal opinions rather than doing the patient work of understanding.
Do not answer a fool according to his folly, or you yourself will be like him.
Wisdom sometimes refuses a folly-shaped argument so the responder does not imitate its distorted terms.
Better is a poor but wise youth than an old but foolish king who no longer knows how to take a warning.
An old king is called foolish when power has made him unwilling to receive warning.
BSB source-word alignment connects this entry to exact verse rows, English rendering, source form, transliteration, and parsing.
How English Renders ItA compact distribution from source-word alignment before the full evidence tables.
Hebrew word. Stupidity conceived as mental heaviness or dullness; the fool's mind lacks quickness and agility
Stupidity conceived as mental heaviness or dullness; the fool's mind lacks quickness and agility
properly, fat, i.e. (figuratively) stupid or silly BDB: stupid fellow Usage: fool(-ish).
How this word appears across different grammatical cases and numbers.
Selected passage-level study witnesses for this word. This section is not the full occurrence list.
Showing 1 selected witness from 70 lexical occurrence verses.
כְּסִיל is built from this root:
Foolishness results in destructive behavior that harms others.Proverbs 10:1
Compound and idiomatic phrases that include this word. Follow a link to study the phrase and how its parts work together.
Kesil is a mirror for moral posture, not a license to rank human value. Proverbs 1 identifies hatred of knowledge, while Proverbs 8 addresses fools with a direct call to gain understanding. Together they expose resistance without erasing the possibility of repentance. Proverbs 18 focuses on a person who would rather air an opinion than understand, making listening and intellectual humility part of wisdom.
Proverbs 13 warns that relationships form habits; companionship with wise people can cultivate wisdom, while participation in reckless patterns can bring harm. Proverbs 26 places apparently opposite instructions together: sometimes answering a fool adopts the fool's terms, while the following verse can require an answer that prevents self-deception. The pair demands situational judgment, not a formula for humiliating people.
Ecclesiastes 4 locates folly in an old ruler who will no longer take warning, so age and office do not guarantee wisdom. Faithful application names conduct precisely, welcomes sincere questions, builds teachable leadership, protects people from repeated recklessness, and avoids applying a biblical warning as a degrading nickname.
Prov.8.5
Kesil is a Hebrew wisdom term commonly rendered fool or foolish. It functions as a moral-practical description within contrasts involving wisdom, knowledge, speech, restraint, and correction, not as a clinical or intellectual assessment.
Jesus and the apostles warn against hardened hearing, empty controversy, reckless speech, and self-deception while also commanding gentleness and patience in correction. These themes preserve moral seriousness without authorizing ableist contempt or verbal abuse.