Jamieson, Fausset & Brown

shun--literally, "stand above," separate from, and superior to. vain--opposed to "the truth" (Ti2 2:15). babblings--with loud voice: opposed to the temperate "word" (Tit 3:9). increase--Greek, advance"; literally, "strike forward": an image from pioneers cutting away all obstacles before an advancing army. They pretend progress; the only kind of progress they make is to a greater pitch of impiety. more ungodliness--Greek, "a greater degree of impiety."