Withdraw yourselves from (στέλλεσθαι ὑμᾶς ἀπὸ)
Στέλλεσθαι, Po. In the active voice, to place, arrange, equip: in the middle voice, to provide for, take care. See 2Co 8:20. Here with ἀπὸ from, to place one's self away from.
Disorderly (ἀτάκτως)
This adverb, the verb ἀτακτέω, and the adjective ἄτακτος are found only in Paul, and only in the Thessalonian Epistles. See on 1Th 5:14.