Adverb
in a dogged and pertinacious manner
Source: WordNetIt is no use for one to stand in the shade and complain that the sun does not shine upon him. He must come out resolutely on the hot and dusty field where all are compelled to antagonize with stubborn difficulties, and pertinaciously strive until he conquers, if he would deserve to be crowned. Elias Lyman Magoon
he struggled pertinaciously for the new resolution Source: Internet
Chernow, 2004, p. 574 Washington was so appalled by the resolutions that he told Patrick Henry that if "systematically and pertinaciously pursued", the resolutions would "dissolve the union or produce coercion." Source: Internet
George Washington was so appalled by them that he told Patrick Henry that if "systematically and pertinaciously pursued", they would "dissolve the union or produce coercion". Source: Internet