Prematurely rhymes with:
demurely, poorly, purely, securely, surely, airlie, arley, arlie, austerely, barely, barley, bierley, bierly, carley, carli, carly, cavalierly, charley, charlie, clearly, corley, darley, dearly, decarli, demurely, fairley, fairlie, fairly, farley, farly, gnarly, gorley, gourley, harley, hourly, kalgoorlie, marley, mccarley, mcsorley, merely, morley, myrlie, narly, nearly, orly, parley, poorly, purely, rarely, sarli, securely, severely, sincerely, sorely, sorlie, squarely, storlie, surely, thorley, torley, unfairly, varley, warley, wehrli, wehrly, whorley, yearly