Sloppier rhymes with:
copier, copier, dampier, frappier, grumpier, happier, lapier, napier, nappier, photocopier, rapier, skimpier
Sloppier sounds like:
scalfaro, scalper, schlafer, schleifer, schlieper, selover, silber, silvar, silveira, silver, silvera, silveri, silveria, silverio, silverware, silvery, slavery, sleeper, sleepwear, slifer, slipper, slippery, sliver, slobber, sloper, slover, solver, sulfur, sulphur