the mind > emotion > pleasure > merriment > [adjective] > excessively
over-blitheeOE
mad-merry1600
1600 A. Munday et al. First Pt. True Hist. Sir I. Old-castle sig. C4 Ye old mad mery Constable, art thou aduis'de of that.
1950 R. GravesOccupation: Writer 49 Type humour will continue with this mad-merry civilization to confirm changes of fashion in dress and dancing and politics.