Jamieson, Fausset and Brown on 2 Timothy 3:2

2. men--in the professing Church. Compare the catalogue, Ro 1:29, &c., where much the same sins are attributed to heathen men; it shall be a relapse into virtual heathendom, with all its beast-like propensities, whence the symbol of it is "a beast" (Re 13:1, 11, 12, &c.; 17:3, 8, 11).

covetous--Translate, "money-loving," a distinct Greek word from that for "covetous" (see on Col 3:5). The cognate Greek substantive (1Ti 6:10) is so translated, "the love of money is a (Greek, not 'the') root of all evil."

boasters--empty boasters [Alford]; boasting of having what they have not.

proud--overweening: literally, showing themselves above their fellows.

blasphemous--rather, "evil-speakers," revilers.

disobedient to parents--The character of the times is even to be gathered especially from the manners of the young [Bengel].

unthankful--The obligation to gratitude is next to that of obedience to parents.

unholy--irreligious [Alford]; inobservant of the offices of piety.