2551. kakologeó
Lexical Summary
kakologeó: To speak evil of, to revile, to curse, to insult.

Original Word: κακολογέω
Part of Speech: Verb
Transliteration: kakologeó
Pronunciation: kä-ko-lo-GEH-o
Phonetic Spelling: (kak-ol-og-eh'-o)
KJV: curse, speak evil of
NASB: speaks evil, speak evil, speaking evil
Word Origin: [from a compound of G2556 (κακός - evil) and G3056 (λόγος - word)]

1. to revile

Strong's Exhaustive Concordance
curse, speak evil of.

From a compound of kakos and logos; to revile -- curse, speak evil of.

see GREEK kakos

see GREEK logos

HELPS Word-studies

2551 kakologéō (from 2556 /kakós, "a malicious disposition" and 3004 /légō, "speaking to a conclusion") – properly, to speak evil, using malicious, damaging words that are calculated to destroy (misrepresent).

2551 /kakologéō ("calculated evil-speaking") tries to make evil seem good ("positive"), i.e. presenting what is wrong as "right" (or the reverse). 2551 (kakologéō) issues from a twisted disposition (make-up, perspective).

[Note the fundamental meaning of the root (2556 /kakós).]

NAS Exhaustive Concordance
Word Origin
from a comp. of kakos and logos
Definition
to speak ill of
NASB Translation
speak evil (1), speaking evil (1), speaks evil (2).

Thayer's Greek Lexicon
STRONGS NT 2551: κακολογέω

κακολογέω, κακολόγω; 1 aorist infinitive κακολογῆσαί; (κακολόγος); equivalent to κακῶς λέγω (which the old grammarians prefer, see Lob. ad Phryn., p. 200);

1. to speak ill of, revile, abuse, one; to calumniate, traduce: τινα, Mark 9:39; τί, Acts 19:9; (2 Macc. 4:1; Lysias, Plutarch, others).

2. Hellenistically, to imprecate evil on, curse: τινα, Matthew 15:4; Mark 7:10 (so for קִלֵּל, Proverbs 20:20; Ezekiel 22:7; Exodus 22:28).

Topical Lexicon
Meaning and Concept

The term denotes the deliberate use of speech that harms, maligns, or calls down a curse upon another. It embraces verbal abuse, slander, and any form of speech that seeks evil for its object. Scripture consistently treats such utterance as the antithesis of love, honor, and truth.

Old Testament Foundations

The idea is rooted in the Mosaic Law. Exodus 21:17 and Leviticus 20:9 pronounce death on “whoever curses his father or mother,” underscoring the seriousness of reviling those whom God has placed in positions of honor. Proverbs repeatedly condemns malicious speech (for example, Proverbs 20:20; Proverbs 30:11). Thus the covenant community was taught that words possess moral weight and covenantal consequence.

Occurrences in the New Testament

1. Matthew 15:4 and Mark 7:10 quote the Mosaic injunction, showing that Jesus upholds the Law’s standard while exposing traditions that nullify its intent. The verb here preserves the gravity of cursing parents.
2. Mark 9:39 records Jesus’ restraint toward a man casting out demons in His name: “No one who performs a miracle in My name can soon afterward speak evil of Me.” Service in Christ’s name naturally conflicts with any desire to revile Him.
3. Acts 19:9 describes opponents in Ephesus “speaking evil of the Way.” Their verbal hostility illustrates how maligning words often accompany hardened unbelief and persecution of the church.

Theological Themes

Reverence vs. Contempt: By linking honor of parents with the sanctity of speech, Scripture ties godliness to respect for God-ordained authority.

Speech as Morally Charged: Words reveal the heart (Matthew 12:34). Evil speech signals rebellion against God and His Messiah (Acts 19:9).

The Incompatibility of Blessing and Cursing: Mark 9:39 anticipates the apostolic teaching that “blessing and cursing come out of the same mouth” ought not to be so (James 3:10).

Ministry Implications

Pastoral correction must confront reviling as sin, whether in families, congregations, or society. Evangelists should expect the Way to be “spoken against” yet remain steadfast, following Paul’s example of withdrawing to teach disciples more effectively (Acts 19:9–10). Miraculous ministry, rightly practiced, silences slander and magnifies Christ (Mark 9:39).

Practical Exhortation

Believers are called to honor parents, leaders, and one another (Ephesians 6:2; Romans 12:10), replacing corrupt talk with “only what is good for building up” (Ephesians 4:29). Where repentance is needed, restoration is secured through confessing sinful speech and embracing the cleansing power of Christ’s blood (1 John 1:7–9).

Related Words and Concepts

• Blasphemeo – to blaspheme, speak irreverently of God or sacred things.
• Loidoreo – to revile, heap abuse.
• Katalaleo – to speak against, backbite.

These terms overlap in warning that destructive speech opposes the character of God, who is “slow to anger and rich in love” (Psalm 145:8).

Select Cross-References

Exodus 21:17; Leviticus 20:9; Proverbs 20:20; Matthew 12:34–37; James 3:8–12; 1 Peter 2:1; Revelation 22:15.

Summary

Strong’s Greek 2551 exposes the sinfulness of speech that seeks another’s harm. From parental honor to Christ-centered ministry, Scripture presents a unified witness: the tongue is meant for blessing, truth, and edification, never for cursing. Consequently, the redeemed community must guard its words, reflecting the gracious speech of its Lord.

Forms and Transliterations
εκακολόγουν κακολογησαι κακολογήσαί κακολογῆσαί κακολογήσεις κακολογουντες κακολογούντες κακολογοῦντες κακολογούντος κακολογων κακολογών κακολογῶν kakologesai kakologêsaí kakologēsai kakologē̂saí kakologon kakologôn kakologōn kakologō̂n kakologountes kakologoûntes
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Englishman's Concordance
Matthew 15:4 V-PPA-NMS
GRK: καί Ὁ κακολογῶν πατέρα ἢ
NAS: AND MOTHER,' and, 'HE WHO SPEAKS EVIL OF FATHER
KJV: mother: and, He that curseth father or
INT: and He who speaks evil of father or

Mark 7:10 V-PPA-NMS
GRK: καί Ὁ κακολογῶν πατέρα ἢ
NAS: AND YOUR MOTHER; and, 'HE WHO SPEAKS EVIL OF FATHER
KJV: mother; and, Whoso curseth father or
INT: and He who speaks evil of father or

Mark 9:39 V-ANA
GRK: δυνήσεται ταχὺ κακολογῆσαί με
NAS: soon afterward to speak evil of Me.
KJV: can lightly speak evil of me.
INT: be able readily to speak evil of me

Acts 19:9 V-PPA-NMP
GRK: καὶ ἠπείθουν κακολογοῦντες τὴν ὁδὸν
NAS: and disobedient, speaking evil of the Way
KJV: believed not, but spake evil of that way
INT: and disobeyed speaking evil of the way

Strong's Greek 2551
4 Occurrences


κακολογῆσαί — 1 Occ.
κακολογῶν — 2 Occ.
κακολογοῦντες — 1 Occ.

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