Quick Definition
ψευδάδελφος, ου, ὁ n.m. a false brother
Strong's Definition
a spurious brother, i.e. pretended associate
Derivation: from G5571 (ψευδής) and G80 (ἀδελφός);
KJV Usage: false brethren
UBS Dictionary of the Greek New Testament
noun, m. | -ου | ψεύδομαι + ἀδελφός
11.36 · Groups and Classes of Persons and Members of Such Groups and Classes · Socio-Religious
false brother, one who only pretends to be a fellow believer in Christ an individual who pretends to be a close member of a socio-religious group but is not (see 11.22, 11.23, and 11.24) It is frequently necessary to make explicit the full implications of ‘false brother’ by translating ‘one who pretends to be a fellow believer in Christ but is not.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ψευδ-άδελφος, -ov, 6, (ψευδής and ddeddds), a false brother, i. e. one who ostentatiously professes to be a Christian, but is destitute of Christian knowledge and piety: 2Co. xi. 26; Gal. ii. 4.
Mounce Concise Greek Dictionary
ψευδάδελφος pseudadelphos 2x
a false brother, a pretend Christian, 2 Cor. 11:26; Gal. 2:4*
Abbott-Smith Greek Lexicon
*† ψευδ-άδελφος, -ου, ὁ a false brother: of professing Christians, II Co 11:26, Ga 2:4.†
Liddell-Scott-Jones — Greek-English Lexicon
ψευδάδελφος (pseudadelphos) — false brother. ψευδ-άδελφος [ᾰ], ὁ, false brother, pretended Christian, [NT]