1) Adamantly 2) Cussedly 3) Defiantly 4) Determinedly 5) Doggedly 6) Grimly 7) Inflexibly 8) Insistently 9) Mulishly 10) Obdurately 11) Obstinately 12) Persistently 13) Pig-headedly 14) Resolutely 15) Steadfastly 16) Tenaciously 17) With unbending will 1) Cussedly 2) Determinedly 3) Doggedly 4) Mulishly 5) Obdurately 6) Obstinately 7) Unbendingly 
[adv] - in a stubborn unregenerate manner
pig-headedly adverb in a stubborn unregenerate manner; `she remained stubbornly in the same position`