Roget's Thesaurus: Entry 327 (Tenacity)

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#327. Tenacity. -- N. {ant. 328} tenacity, toughness, strength; (cohesion) 46; grip, grasp, stickiness, (cohesion) 46; sequacity[obs]; stubbornness &c. (obstinacy); glue, cement, glutinousness[obs], sequaciousness[obs], viscidity, (semiliquidity) 352.

leather; white leather, whitleather[obs]; gristle, cartilage.

unbreakability, tensile strength.

V. be tenacious &c. adj.; resist fracture.

grip, grasp, stick (cohesion) 46.

Adj. tenacious, tough, strong, resisting, sequacious[obs], stringy, gristly cartilaginous, leathery, coriaceous[obs], tough as whitleather[obs]; stubborn &c. (obstinate) 606.

unbreakable, indivisible; atomic.