G4910–συνευωχέομαι–suneuōcheomai

And shall receive the reward of unrighteousness, as they that count it pleasure to riot in the day-time. Spots they are and blemishes, sporting themselves with their own deceivings while they feast with you;

συνευωχούμενοι suneuōchoumenoi “feasting with”

These are spots in your feasts of charity, when they feast with you, feeding themselves without fear: clouds they are without water, carried about by winds; withered autumnal trees, without fruit, twice dead, plucked out by the roots;

συνευωχούμενοι, suneuōchoumenoi “feasting together [with you]”