Synonyms to mettlesomely

gamely, audaciously, boldly, bravely, bulldoggishly, chivalrously, courageously, daringly, dauntlessly, doughtily, fearlessly, gallantly, gutsily, hardily, heroically, intrepidly, knightly, like a man, like a soldier, manfully, pertinaciously, pluckily, resolutely, spunkily, stalwartly, stoutly, tenaciously, unfearfully, unfearingly, valiantly, valorously, yeomanly, arduously, bec et ongles, effortfully, hammer and tongs, hard, heart and soul, industriously, laboriously, operosely, strenuously, the hard way, toilsomely, tooth and nail, with a will, with effort