Rightly rhymes with:
brightly, forthrightly, sprightly, brightly, forthrightly, knightly, lightly, nightly, politely, slightly, sprightly, stitely, tightly, unsightly, whiteley, whitely
Rightly sounds like:
ragsdale, recital, rectal, reichstuhl, reschedule, resdel, resettle, residual, restyle, rhizoidal, riccitelli, rigidly, rookstool, ruggedly, rustle