Here's what rhymes with vacillatingly.
fascinatingly gratingly hesitatingly irritatingly aggravatingly titillatingly devastatingly exasperatingly penetratingly calculatingly accommodatingly nauseatingly unhesitatingly deprecatingly humiliatingly illuminatingly infuriatingly invigoratingly excruciatingly ingratiatingly intimidatingly Words that almost rhyme with vacillatingly
ragingly engagingly amazingly rakishly basically creatively unfailingly animatedly scathingly unavailingly abrasively piratically evasively pervasively imitatively jadedly qualitatively authoritatively persuasively algebraically appreciatively collaboratively meditatively exaggeratedly prosaically entertainingly exasperatedly lackadaisically legislatively uncomplainingly complicatedly administratively manipulatively