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per·ti·na·cious

pertinacious

pronunciation:
puhr t neI shs
part of speech: adjective
definition 1: tenacious in purpose, opinion, or the like; persevering.
If he'd been more pertinacious, I'm sure he would have won over the committee's support.
synonyms:
firm, persevering, persistent, tenacious
similar words:
assiduous, diligent, laborious, sedulous, tireless, unshakable
definition 2: stubbornly determined in action; persistent.
synonyms:
dogged, persistent
similar words:
adamant, firm, hardheaded, inflexible, insistent, mulish, resolute, stubborn, unbending, uncompromising
derivations: pertinaciously (adv.), pertinaciousness (n.)