Doggedly

Adverb

 * 1) in a way that is stubbornly persistent
 * 2) * 1983, Paul Simon, "Train in the Distance",
 * She was married to someone. / He was doggedly determined he would get her.

Thesaurus
assiduously, bullheadedly, devotedly, diligently, faithfully, headstrongly, indefatigably, industriously, insistently, loyally, obstinately, patiently, perseveringly, persistently, persistingly, pertinaciously, ploddingly, relentlessly, resolutely, sedulously, sloggingly, stubbornly, tenaciously, tirelessly, unabatingly, uncooperatively, unfalteringly, unflaggingly, unflinchingly, unintermittingly, uninterruptedly, unregenerately, unrelentingly, unremittingly, unrestingly, unsleepingly, unswervingly, untiringly, unwaveringly, unwearyingly, wearilessly, willfully, with set jaw