What is another word for "tenacity"?

Roget's Thesaurus (1911) lists these synonyms for "tenacity": ant, atomic, back, bird, bond, captive, cartilage, cartilaginous, cement, clench, clinch, close, clutch, cohesion, coriaceous, custody, detain, detention, entail, fast, finger, firm, fist, forceps, fracture, glue, glutinousness, grasp, grip, gripe, gristle, gristly, ground, hand, have, hold, hook, hug, husband, inalienable.