Strong's Concordance

Original word: καταλαλέω
Transliteration: katalaleó
Definition (short): speak
Definition (full): to speak evil of

NAS Exhaustive Concordance

Word Origin: from katalalos
Definition: to speak evil of
NASB Translation: slander (1), slandered (1), speak against (1), speaks against (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From katalalos; to be a traducer, i.e. To slander -- speak against (evil of).

see GREEK katalalos

KJV: Speak not evil one of another, brethren. He that speaketh evil of his brother, and judgeth his brother, speaketh evil of the law, and judgeth the law: but if thou judge the law, thou art not a doer of the law, but a judge.
NASB: Do not speak against one another, brethren. He who speaks against a brother or judges his brother, speaks against the law and judges the law; but if you judge the law, you are not a doer of the law but a judge of it.
KJV: Having your conversation honest among the Gentiles: that, whereas they speak against you as evildoers, they may by your good works, which they shall behold, glorify God in the day of visitation.
NASB: Keep your behavior excellent among the Gentiles, so that in the thing in which they slander you as evildoers, they may because of your good deeds, as they observe them, glorify God in the day of visitation.