Tenacious

He's a tenacious guy who always manages to come out on top. He's the kind of guy who can turn any situation to his advantage.

To survive in a hostile environment, one must be able to improvise and be tenacious.

Metaphors are much more tenacious than facts.

He was tenacious.

Tom is tenacious, isn't he?

Sami was a tenacious person.

Mary is tenacious, isn't she?

I can be very tenacious.

Lucy commenced some apology for their long delay, but, conscience-struck, became confused as she proceeded; and when Ravenswood, coming to her assistance, endeavoured to render the explanation complete and satisfactory, he only involved himself in the same disorder, like one who, endeavouring to extricate his companion from a slough, entangles himself in the same tenacious swamp.

The tenacious depths of the quicksand, as is usual in such cases, retained its prey.