Jamieson, Fausset and Brown on 2 Thessalonians 3:2

2. that we ... be delivered from unreasonable ... men--literally, men out of place, inept, unseemly: out of the way bad: more than ordinarily bad. An undesigned coincidence with Ac 18:5-9. Paul was now at Corinth, where the Jews "opposed themselves" to his preaching: in answer to his prayers and those of his converts at Thessalonica and elsewhere, "the Lord, in vision," assured him of exemption from "the hurt," and of success in bringing in "much people." On the unreasonable, out-of-the way perversity of the Jews, as known to the Thessalonians, see 1Th 2:15, 16.

have not faith--or as Greek, "the faith" of the Christian: the only antidote to what is "unreasonable and wicked." The Thessalonians, from their ready acceptance of the Gospel (1Th 1:5, 6), might think "all" would similarly receive it; but the Jews were far from having such a readiness to believe the truth.