J8O1L1L1Y4
15 points
JOLLY is validvalid
cheerful [adj JOLLIER, JOLLIEST] : JOLLILY [adv], JOLLINESS [n] / to put in a good humor for one's own purposes [v JOLLIED, JOLLIES, JOLLYING]
mirthful [adj JOLLIER, JOLLIEST, JOLLILY] / to put or keep in a good humour [v JOLLIED, JOLLYING, JOLLIES]