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