Or search: laughably, ludicrously, ridiculously
4 Syllables: SUUU
barbarously, dangerously, dexterously, generously, honorably, honourably, hospitably, humorously, moderately, nominally, ominously, profitably, rigorously, tolerably, treacherously, vigorously
5 Syllables: USUUU
anonymously, intolerably

Found 18 words across 2 groupings.