SG Heritage Dictionary

Toughness [Noun] Webster's Dictionary 1828

1. tuf'ness. The quality of a substance which renders it in some degree flexible, without brittleness or liability to fracture; flexibility with a firm adhesion of parts; as the toughness of steel.

2. Viscosity; tenacity; clamminess; glutinousness; as the toughness of mucus.

3. Firmness; strength of constitution or texture.

Toughness [Noun] Webster's Dictionary 1913

The quality or state of being tough.

Coherence Roget’s Thesaurus §46

N. coherence, adherence, adhesion, adhesiveness, concretion, accretion, conglutination, agglutination, agglomeration, aggregation, consolidation, set, cementation, sticking, soldering, connection, dependence, tenacity, toughness, stickiness, inseparability, inseparableness, bur, remora, conglomerate, concrete

V. cohere, adhere, stick, cling, cleave, hold, take hold of, hold fast, close with, clasp, hug, grow together, hang together, twine round, stick like a leech, stick like wax, stick close, cling like ivy, cling like a bur, adhere like a remora, adhere like dejanira's shirt, glue, agglutinate, conglutinate, cement, lute, paste, gum, solder, weld, cake, consolidate, agglomerate

Adj. cohesive, adhesive, adhering, cohering, tenacious, tough, sticky, united, unseparated, unsessile, inseparable, inextricable, infrangible, compact

Tenacity Roget’s Thesaurus §327

N. {ant. 328} tenacity, toughness, strength, # (cohesion) 46, grip, grasp, stickiness, (cohesion) 46, sequacity, stubbornness &c. (obstinacy), glue, cement, glutinousness, sequaciousness, viscidity, (semiliquidity) 352, leather, white leather, whitleather, gristle, cartilage, unbreakability, tensile strength

V. be tenacious, resist fracture, grip, grasp, stick (cohesion) 46

Adj. tenacious, tough, strong, resisting, sequacious, stringy, gristly cartilaginous, leathery, coriaceous, tough as whitleather, stubborn, unbreakable, indivisible, atomic