tenacious - vocabulary

  edgood  —  Grammar Tips

Unyielding, holding fast, keeping a firm grip, stubborn, obstinate.
Isabel was perfectly aware that she had not taken the measure of Pansy’s tenacity, which might prove to be inconveniently great; but she inclined to think the young girl would not be tenacious, for she had the faculty of assent developed in a very much higher degree than that of resistance. She would cling, yes, she would cling; but it really mattered to her very little what she clung to.

—Henry James The Portrait of a Lady (1908)

© Grammar.com