Here's what rhymes with bacchanalian.

Consider these alternatives

superfluity / beauty kaleidoscopic / logic evocations / relations carousing / housing gracefulness / faithfulness hedonistic / characteristic conceptualisation / relation merriment / element luau / uau experimentalism / given cloying / employing profusion / conclusion emotionalism / given convivial / trivial phantasmagoric / historic dissolute / group verbose / those frivolity / quality