顽强 (wán qiáng): tenacious, indomitable

Even though he lost both arms, he still tenaciously learned to write, cook, and even swim with his feet.

This pine tree grows tenaciously in the crevice of the cliff; no matter how the wind blows and rain beats, it never bows its head.

With only one minute left in the match, the players tenaciously defended and finally kept their lead, winning the championship.

With tenacious willpower, she persisted in rehabilitation training every day and finally stood up again after a year.

This small company survived tenaciously in the fierce market competition, relying on continuous innovation and quality service.