Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Latin
Origin: pertinax, from tenax; TENACIOUS

pertinacious

 adjective
     
per‧ti‧na‧cious formal
continuing to believe something or to do something in a very determined way [= tenacious]
—pertinaciously adverb
—pertinacity noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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