And filthiness; αἰσχρότης, implying that such things are disgraceful, ugly, revolting, the opposite of καλός, fair, comely, attractive. And foolish talking or jesting, which are not becoming. This would be well understood in sensual, frivolous Ephesus; a light, bantering, jesting kind of talk, seasoned with double entendres and obscene allusions, very pernicious in its moral effect.
There is no reason to suppose that the apostle meant to condemn all play of humor, which is a Divine gift, and which in moderation has its own useful place as a means of refreshing and invigorating the spirit; it was the jesting associated with ribaldry that drew his reproof.
But rather giving of thanks. εὐχαριστία is somewhat similar in sound to εὐτραπελία, jesting: the reason for putting the one in opposition to the other is not very apparent; the meaning seems to be that, in place of giving vent to lively feelings in frivolous talk and jesting, it is better for Christians to do so by pouring out their hearts in thanksgivings to God for all his goodness.