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American Dictionary of the English Language

Webster's Dictionary 1828

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Pertinacious


PERTINA'CIOUS, adjective [Latin pertinax; per and teneo, to hold.]

1. Holding or adhering to any opinion, purpose or design with obstinacy; obstinate; perversely resolute or persistent; as pertinacious in opinion; a man of pertinacious confidence.

2. Resolute; firm; constant; steady.

Diligence is a steady, constant, pertinacious study--

[This word often implies a censurable degree of firmness of constancy, like obstinacy.