Слово "tenacious". Англо-русский словарь Мюллера

The cardinal has a tenacious memory and a long arm; you may depend upon it, he will repay you by some ill turn."

“We are close there now,” my friend remarked. “This fellow Merryweather is a bank director, and personally interested in the matter. I thought it as well to have Jones with us also. He is not a bad fellow, though an absolute imbecile in his profession. He has one positive virtue. He is as brave as a bulldog and as tenacious as a lobster if he gets his claws upon anyone. Here we are, and they are waiting for us.”

Galatea Dunkel was a tenacious loser.

“Eight years! you must be tenacious of life.

Georges Bengalsky, for instance, after spending three months in the clinic, recovered and left it, but had to give up his work at the Variety, and that at the hottest time, when the public was flocking after tickets: the memory of black magic and its exposure proved very tenacious.