These are grumblers, malcontents, following their own passions, loud-mouthed boasters, flattering people to gain advantage.
οὗτοί εἰσιν γογγυσταὶ μεμψίμοιροι κατὰ τὰς ἐπιθυμίας ἑαυτῶν πορευόμενοι, καὶ τὸ στόμα αὐτῶν λαλεῖ ὑπέρογκα, θαυμάζοντες πρόσωπα ὠφελείας χάριν.
Haydock Catholic Bible Commentary: Jude
Speaketh proud things, admiring persons for gain's sake. It is a part of the character of these heretics to seem to admire and flatter others when they can gain by it. Wi.