man ‧ ful ‧ ly /ˈmænf ə li/ BrE AmE adverb old-fashioned
[ Word Family: noun : ↑ man , ↑ manhood , ↑ mankind ; adjective : ↑ manly ≠ ↑ unmanly , manned ≠ ↑ unmanned , ↑ mannish ; verb : ↑ man ; adverb : ↑ manfully ]
in a brave determined way:
Ed struggled manfully with his case.