Harshly rhymes with:
parshley, parshley, ashley, bearishly, bullishly, daschle, deliciously, devilishly, especially, feverishly, foolishly, freshley, freshly, ghoulishly, girlishly, lashley, lavishly, leschly, lushly, parshley, pashley, sheepishly, slavishly, sluggishly, stylishly
Harshly sounds like:
heroically, herschel, herschell, hierarchical, hirzel, horsely, horsley