Ranked by relevance and common usage.
Keep "pertinacious" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "pertinacious" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "pertinacious", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "pertinacious" or choose a simpler alternative from the closest-match group.
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
4 total sentences available.
When that divine took his leave, not a little discomfited and amazed at the pertinacious obstinacy of the women, Laura repeated her embraces and arguments with tenfold fervour to Helen, who felt that there was a great deal of cogency in most of the latter.
Source: wiktionary
He would really have to make up his mind to care for his wife or not to care for her. What would Lady Vandeleur say to one alternative, and what would little Joscelind say to the other? That is what it was to have a pertinacious father and to be an accommodating son.
Source: wiktionary
For, whether they were attracted by the lantern, or by the unaccustomed smell of a white man for which they had been waiting for the last thousand years or so, I know not; but certainly we were presently attacked by tens of thousands of the most bloodthirsty, pertinacious, and huge mosquitoes that I ever saw or read of.
Source: wiktionary
[O]ne of the Dissenters, which I could, but forbear, to name appeared to Dr. Sanderson to be so bold, so troublesome, and so illogical in the dispute, as forced patient Dr. Sanderson, who was then Bishop of Lincoln, and a moderator with other Bishops, to say, with an unusual earnestness, "That he had never met with a man of more pertinacious confidence, and less abilities, in all his conversation."
Source: wiktionary
Closest matches include dogged, persistent, tenacious, unyielding, assiduous.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.