Testily rhymes with:
hastily, accidentally, anecdotally, atalie, brutally, coincidentally, continentally, digitally, environmentally, experimentally, fatally, fundamentally, governmentally, hastily, heartily, horizontally, incidentally, incrementally, italy, jauntily, mentally, mightily, monumentally, mortally, natalie, nathalie, nattily, ornamentally, ottilie, philately, scantily, subtly, temperamentally, totally, vitally, wittily
Testily sounds like:
tacitly, tactile, teasdale, textile, textual, thistle, tightly, tisdale, tisdel, tisdell