Synonyms and related words :
arduously, bec et ongles, committedly, decidedly, decisively, determinedly, devotedly, earnestly, effortfully, firmly, fixedly, hard, heart and soul, in all seriousness, in earnest, in good earnest, industriously, inflexibly, laboriously, like a bulldog, like a leech, manfully, obstinately, operosely, perseveringly, persistently, purposefully, relentlessly, resolutely, resolvedly, seriously, sincerely, singlemindedly, staunchly, steadfastly, steadily, strenuously, tenaciously, the hard way, toilsomely, tooth and nail, unswervingly, unyieldingly, wholeheartedly, with a will, with constancy, with effort, with total dedication