Roundly rhymes with:
profoundly, soundly, bindley, blandly, blindly, brindley, chandley, fendley, findlay, findley, fondly, friendly, grandly, grindley, handley, handly, hendley, hindley, hundley, kindley, kindly, lindley, pendley, profoundly, secondly, soundly, spendley, standley, unfriendly, windley
Roundly sounds like:
randal, randall, randel, randell, randle, randol, rantala, rantoul, reindel, reindl, remedial, remodel, remotely, rendall, rendell, rental, rindahl, rintala, rintel, rundall, rundell, rundle