2 Syllablessternly
Now you can make multisyllabic rhymes in the new rhymit app :)
3 Syllableskernelly, vernally
4 Syllablesdiurnally, eternally, externally, fraternally, infernally, internally, maternally, nocturnally, paternally, supernally, taciturnly
5 Syllablessempiternally