Synonyms of 'firmly'

bona fide, close, compactly, consistently, constantly, decidedly, decisively, densely, determinedly, devotedly, dourly, earnestly, faithfully, fast, firm, fixedly, forcefully, grimly, hardly, heartily, heavily, imperviously, ironhandedly, mightily, resolutely, resolvedly, robustly, seriously, sincerely, solid, thick, tight, vigorously, wholeheartedly