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