'tenacious about' is correct and usable in written English.
You can use it to describe someone or something that is determined and persistent in their endeavors. For example, you could say: "She was tenacious about reaching her goal of running a marathon."
"Much more tenacious about securing a slot in my diary.
And he's tenacious about his beliefs: an ardent atheist, a fervent supporter of animal rights.
"Good things come to those who wait, I guess," Mr. Brennan said, laughing, then pausing to add: "And plan and fight and are tenacious about their futures".
Sarah Wood, a co-founder of Unruly Media says this is crucial: "Attend networking events, get active on LinkedIn and be always be tenacious about it".
Sure, being female may bring a different approach, but the women I know are just as tenacious about getting their movies made as the men.
"I am very conscious that at times that weariness makes me fractious but I am nothing if not honest, blunt and tenacious about our cause," he said.
Undercutting tenacious assumptions about Jewish passivity or cooperation, Bauer surveys the widely different conditions from ghetto to ghetto, from council to council, showing us how the Jews behaved in the face of whatever options remained to them.
Many feminists have made tenacious arguments about the lack of any substantive physical or mental differences between men and women as if the political equality of the sexes depended on it.
Despite this relatively short colonial regime, there is a remarkably tenacious Frenchness about the country, manifested most notably in the widespread use of French as a second language -- and in the croissants.
Nor did it stop her tenacious response about the recent kerfuffle over her character's notorious bikini.
We do really serious educational work because we have to the best we can to counteract such longstanding and tenacious stereotypes about the continent".
