Mortally rhymes with:
heartily, accidentally, anecdotally, atalie, brutally, coincidentally, continentally, digitally, environmentally, experimentally, fatally, fundamentally, governmentally, hastily, heartily, horizontally, incidentally, incrementally, italy, jauntily, mentally, mightily, monumentally, natalie, nathalie, nattily, ornamentally, ottilie, philately, scantily, subtly, temperamentally, testily, totally, vitally, wittily
Mortally sounds like:
marital, martel, martell, martella, martelle, martelli, martello, martial, mertle, mirtle, moertel, mortal, mortell, myrtle