(adv.) In an irresistible manner.

adamantly bec et ongles bona fide close closely committedly compactly consistently constantly deafeningly decidedly decisively densely determinedly devotedly dourly earnestly faithfully fast firm fixedly forcefully forcibly grimly hammer and tongs hardly heart and soul heartily heavily immovably immutably imperviously implacably impliably impregnably in all seriousness in earnest in good earnest in good faith inexorably inflexibly inseparably intensely intransigently invincibly invulnerably ironhandedly irreconcilably irresistibly like a bulldog like a leech loudly loyally lustily mightily obdurately obstinately perseveringly persistently powerfully pungently purposefully relentlessly resistantly resolutely resolvedly responsibly rigidly rigorously robustly ruggedly securely seriously sincerely singlemindedly solid solidly soundly stalwartly staunchly steadfastly steadily sternly stiffly stoutly strongly sturdily tenaciously thick thickly tight tightly tooth and nail unalterably unbendingly unchangeably uncompromisingly unregenerately unrelentingly unswervingly unwaveringly unyieldingly vigorously wholeheartedly with a will with constancy with good faith with total dedication