"tenacious enough" is correct and usable in written English.
You can use it to show that someone or something has enough determination or commitment to achieve a goal. For example: "His tenacious attitude was enough to get him the job."
Even if I am tenacious enough to wrestle an answer from a clue, I then face the second round: entering the answers into the diagram.
This theory, known as "panspermia" (literally, "seeds everywhere"), turns on the existence of organisms tenacious enough to be able to survive long and difficult journeys across the vast distances of interstellar space.
Hidden in the Chomphet district jungle, for those tenacious enough to track it down, is the royal cemetery (with the tomb of the mother of the last king of Laos).
The solution he hit upon was so obvious that it never occurred to many of his best customers: he turned the high-fashion logos into huge silk screens, and then, through trial and error, found a paint tenacious enough to adhere to the soft plonge leather he liked to use.
The Crosstown clinic, by contrast, is prescribing top-quality stuff diacetylmorphine made in Switzerland to 120 people whose addictions are tenacious enough to warrant the treatment.The hope is that they will take safer drugs, lead more regular lives and eventually move to methadone.
"Bezos said that he married MacKenzie after searching for someone tenacious enough to break him out of a Third World prison.
He was tenacious and circumspect enough as a screenplay writer to beat them at their own game.
As much "for the people" as "for big business" (and despite the former being under threat) the magnetism of the industry remains unquestioned, promising those tenacious and lucky enough to gain access all the kudos and job-satisfaction they could hope for.
Otherwise, Tottenham looked a little tired, unable to force their way through a tenacious central rump and happy enough with a point.
Clarification and concentration of the people's will would remain the guiding thread of Bolshevik strategy in the run-up to 1917, and Lenin's main concern, early and late, was to achieve a militant and tenacious "unanimity of will" powerful enough to overcome the defences of an indefensible status quo.
AFRICAN RAP -- Africa gives hip-hop's endless hybridization plenty to work with: irresistible dance grooves, multiple languages, tenacious traditional music, and social conditions tough enough to provoke plenty of material.
