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Definition of: pertinacious
(pûr′tə·nā′shəs) adjective
1. Tenacious of purpose; stubbornly adhering to a pursuit or opinion; also, perversely or doggedly persistent.
2. Continuing without abatement; incessant. See synonyms under INFLEXIBLE, OBSTINATE, URGENT. [<L pertinax, -acis <per- thoroughly, very + tenax, -acis tenacious]
—per′ti·na′cious·ly adverb
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