Here's what rhymes with harmonious.
erroneous ceremonious inharmonious acrimonious parsimonious felonious disharmonious unceremonious sanctimonious Words that almost rhyme with harmonious
copious coleus nosiness holiness loneliness commodious melodious cosiness coziness mouldiness gaucheness moldiness doziness associates opprobrious ghostliness unholiness folksiness dissociates incommodious defoliates defoliants disassociates exfoliates