Firmly rhymes with:
wormley, awesomely, bottomley, bramley, bromley, brumley, calmly, chamlee, chumley, comely, comley, comly, cromley, crumley, crumly, dimly, emley, extremely, felmlee, gamely, ghormley, gimli, glumly, gormley, gormly, gramley, grimley, grimly, hamley, handsomely, homely, lamely, lamle, lemley, lumley, namely, parmley, plumley, primly, randomly, remley, romley, rumley, solemnly, superfamily, thomley, timely, uniformly, unseemly, untimely, warmly, wormley
Firmly sounds like:
farinella, farnall, farnell, farnley, fermoyle, formal, formally, formula, fornal