Or search: badly, gravely, severely, earnestly
2 Syllables: SU
cheerfully
3 Syllables: SUU
courteously, curiously, furiously, gloriously, hideously, idiocy, mediately, obviously, previously, studiously, variously
4 Syllables: USUU
conspiracies, conspiracy, erroneously, harmoniously, immediacy, immediately, imperiously, industriously, injuriously, insidiously, laboriously, luxuriously, materially, mysteriously, notoriously, precariously, spontaneously, victoriously
5 Syllables: UUSUU
ignominiously, instantaneously, simultaneously
6 Syllables: UUUSUU
contemporaneously, unceremoniously

Found 35 words across 5 groupings.