NET

12 These men are dangerous reefs at your love feasts, feasting without reverence, feeding only themselves. They are waterless clouds, carried along by the winds; autumn trees without fruit—twice dead, uprooted;

Darby

12 These are spots in your love-feasts, feasting together [with you] without fear, pasturing themselves; clouds without water, carried along by [the] winds; autumnal trees, without fruit, twice dead, rooted up;

KJV

12 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;