John Gill Commentary 2 Timothy 3:4

"traitors, headstrong, puffed up, lovers of pleasure rather than lovers of God;" — 2 Timothy 3:4 (ASV)

Traitors
To their princes and sovereigns, whose deaths they have contrived and compassed, and whom they have assassinated and murdered; and have been betrayers of the secrets of persons, which they have come at by auricular confession to them; and of their best and nearest friends, to preserve and secure themselves.

Heady ;
rash, daring, bold, and impudent, fit to say and do any thing, though ever so vile and wicked.

High, minded ;
puffed and swelled up with a vain conceit of themselves, and speaking great swelling words of vanity;

lovers of pleasure more than lovers of God ;
lovers of sinful pleasures, or the pleasures of sin, which are but for a season, and not God; serving divers lusts and pleasures, and not God; making a god of their belly; sensual idolaters, delighting themselves in their carnal lusts, and not in the service of God.