Manfully rhymes with:
gainfully, painfully, anencephaly, artfully, blissfully, carefully, cheerfully, delightfully, dreadfully, dutifully, faithfully, fitfully, forcefully, frightfully, gainfully, gleefully, gracefully, gratefully, harmfully, helpfully, hopefully, joyfully, lawfully, masterfully, meaningfully, mercifully, mindfully, painfully, peacefully, pitifully, playfully, purposefully, regretfully, respectfully, rightfully, ruefully, skillfully, sniffily, successfully, tactfully, tastefully, tearfully, thankfully, thoughtfully, truthfully, unlawfully, unsuccessfully, usefully, wilfully, willfully, wishfully, wistfully, woefully, wonderfully, wrongfully
Manfully sounds like:
mabel, mabelle, mabile, mable, mabley, mainville, maneval, manvel, manvil, manville, mapel, maple, maybelle, mayville, mobil, mobile, mobilia, mobley, monopole, monopoly, movable, muffle, muffley, mumble