Englishmanfully
adverb
he began to struggle manfully upwards:
bravely, courageously, boldly, gallantly, pluckily, heroically, intrepidly, fearlessly, valiantly, dauntlessly;
resolutely, determinedly, stoutly, stout-heartedly, stalwartly, hard, strongly, vigorously, with might and main, like a Trojan;
with all one's strength, to the best of one's abilities, as best one can, desperately, with desperation, with all the stops out.
▷antonyms timorously.