arduously atrociously barbarously bec et ongles bestially brutally brutishly committedly decidedly decisively determinedly devotedly earnestly effortfully ferociously fiercely firmly fixedly hammer and tongs hard heart and soul in all seriousness in earnest in good earnest industriously inflexibly inhumanly laboriously like a bulldog like a leech manfully mercilessly obstinately operosely perseveringly persistently pitilessly purposefully relentlessly resolutely resolvedly ruthlessly savagely seriously sincerely singlemindedly staunchly steadfastly steadily strenuously tenaciously the hard way toilsomely unswervingly unyieldingly viciously wholeheartedly with a will with constancy with effort with total dedication