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 of winds; trees whose fruit withereth, without fruit, twice dead, plucked up by the roots;

συνευωχούμενοι, suneuōchoumenoi “feasting together [with you]”