Dictionary
pertinacious
adjective
Holding tenaciously to an opinion or purpose.
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The word 'pertinacious' is correct and usable in written English.
It means stubbornly persistent or determined to continue on a course of action despite opposition or difficulty. Example: Despite multiple setbacks, the pertinacious young entrepreneur refused to give up on her dream of starting her own business. She worked tirelessly, never losing her determination and ultimately found success.
Exact(19)
Although Isabella was intensely pious and orthodox in her beliefs and was granted with Ferdinand the title of the "Catholic Kings" by Pope Alexander VI, she could be both imperious and pertinacious in her dealings with the papacy.
The Egyptians were pertinacious keepers of lists, and recorders of methods and procedures.
Bruno was declared an "impenitent, pertinacious, and obstinate heretic," and he was condemned to die.
Spectacular clothes, both pictured and actual, tell tales of pertinacious enchantment, comfort be damned.
The madly pertinacious show, curated by Jeffrey Weiss, with assistance from Anne Wheeler, presents a great many bound books and ring binders full of the artist's recorded data (far fewer examples might have been sufficiently informative).
The museum's functionaries — from floor-polishing janitors to pertinacious scholars and fantastically skilled restorers — emerge as the film's heroes.
If a pertinacious minority can control the opinion of a majority, respecting the best mode of conducting it, the majority, in order that something may be done, must conform to the views of the minority; and thus the sense of the smaller number will overrule that of the greater, and give a tone to the national proceedings.
(He was a more pertinacious reader of art criticism than any other artist I have met, with lively arguments always on tap for recent twists in the discourse).
The horrors of the Mao and Stalin years were possible due to the combination of pertinacious ideology and the concentration of immense power in few hands.
Mikhail Mypansarov's Pan (Emanuel Abruzzo) leads the fauns in a spirited male section — this ballet was, after all, a Bolshoi staple and celebrates a certain bravura — but the revelation of the production is Mr. Zou's Panette, a pertinacious flirt whose soaring leaps trail across the stage like beams of light.
Instead of testing on "inchoate", "pertinacious" and "toady", the exam will put forth words "widely used in college and career", like "synthesis" and "empirical".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com