What makes a fool?

A person who does not follow God's commandment
Sam 13:13

A person who bears resentment.
Job 5:2

A person who says "There is no God."

Psalm 14:1

A person who reviles God and mock at God.
Psalm 74:18,22


Fools don't understand God's words and are senseless.
Psalm 92:6

A person becomes a fool through his rebellious ways and suffers affliction because of his iniquities.
Psalm 107:17

Fools despise wisdom and instruction.
Prov 1:7

Fools hate knowledge and delight in mockery(of God).
Prov 1:22

Fools are destroyed by complacency.
Prov 1:32

Fools get only shame.
Prov 3:35

A foolish son brings grief to his mother.
Prov 10:1

A chattering fool comes to ruin.
Prov 10:8,10

A fool's mouth invites ruin.
Prov 10:14

A fool conceals hatred with lying lips and spreads slander.
Prov 10:18

A fool finds pleasure in wicked schemes.
Prov 10:23

Fools serve the wise.
Prov 11:29

A fool's way seems right to him.
Prov 12:15

Fools show their annoyance at once
Prov 12:16

A fool’s heart blurts out folly.
Prov 12:23

Fools expose their folly.
Prov 13:16

Fools detest turning from evil.
Prov 13:19

A fool tears down his own house.
Prov 14:1

A fool’s mouth lashes out with pride.
Prov 14:3

A fool has no knowledge on his lips.
Prov 14:7