toughness

== English == === Etymology === From Middle English toughnesse, towghnesse, towghenesse, equivalent to tough +‎ -ness. === Pronunciation === === Noun === toughness (countable and uncountable, plural toughnesses) (uncountable) The state of being tough. (materials science, physics, of a metal) Resistance to fracture when stressed, or the degree of such resistance. (psychologically, emotionally, or biologically) Fortitude; hardiness; mettle. Hyponym: intestinal fortitude A formidable difficulty. ==== Derived terms ==== graph toughness ==== Translations ==== === Anagrams === oughtness