#5569 ψευδάδελφος pseudadelphos {psyoo-dad'-el-fos}

 from G5571 and G0080; TDNT - 1:144,22; n m

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) a false brother
 2) one who ostentatiously professes to be a Christian, but is
    destitute of Christian knowledge and piety

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - false brother 2; 2

—Exhaustive Concordance (KJV Translation Frequency & Location)