murmurers - in secret: muttering murmurs against God’s ordinances and ministers in Church and state. Compare Jud 1:8, “speak evil of dignities”; Jud 1:15, “hard speeches”; against the Lord.
complainers - never satisfied with their lot (Num 11:1; compare the penalty, Deu 28:47, Deu 28:48).
walking after their own lusts - (Jud 1:18). The secret of their murmuring and complaining is the restless insatiability of their desires.
great swelling words - (2Pe 2:18).
men’s persons - their mere outward appearance and rank.
because of advantage - for the sake of what they may gain from them. While they talk great swelling words, they are really mean and fawning towards those of wealth and rank.