Jauntily rhymes with:
accidentally, coincidentally, continentally, environmentally, experimentally, fundamentally, governmentally, horizontally, incidentally, incrementally, mentally, monumentally, ornamentally, scantily, temperamentally
accidentally, coincidentally, continentally, environmentally, experimentally, fundamentally, governmentally, horizontally, incidentally, incrementally, mentally, monumentally, ornamentally, scantily, temperamentally