toughness

Collins Concise English Dictionary © HarperCollins Publishers::

toughness /ˈtʌfnɪs/ n

the quality or an instance of being tough
the ability of a metal to withstand repeated twisting and bending, measured by the energy in kilojoules needed to break it
See brittleness, softness

tough adj. -er, -est, adv., n., v.
adj.

strong and long-lasting:tough plastics.
difficult to chew;
not tender:a tough steak.
capable of great endurance;
hardy:tough troops.
not easily influenced, as a person;
stubborn:a tough negotiator.
difficult to perform or deal with:a very tough exam.[It + be + ~ + to + verb]It's tough to get a good grade from him.
hard to bear or suffer through;
severe:a tough struggle to succeed.
vicious;
rough;
violent:a tough neighborhood.
[Informal.]unfortunate;
bad:tough luck.

adv.

v. Idiom.

Informal Terms, Idioms tough it out, [no object]to keep going and resist hardship or difficulty:Instead of giving up, they decided to tough it out.

tough•ly, adv.
tough•ness, n. [uncountable]

tough adj., -er, -est, adv., n., v.
adj.

strong and durable;
not easily broken or cut.
not brittle or tender.
difficult to masticate, as food:a tough steak.
of viscous consistency, as liquid or semiliquid matter:tough molasses.
capable of great endurance;
sturdy;
hardy:tough troops.
not easily influenced, as a person;
unyielding;
stubborn:a tough man to work for.
hardened;
incorrigible:a tough criminal.
difficult to perform, accomplish, or deal with;
hard, trying, or troublesome:a tough problem.
hard to bear or endure (often used ironically):tough luck.
vigorous;
severe;
violent:a tough struggle.
vicious;
rough;
rowdyish:a tough character; a tough neighborhood.
practical, realistic, and lacking in sentimentality;
tough-minded.
[Slang.]remarkably excellent;
first-rate;
great.
hang tough, [Slang.]See hang (def. 50).

adv.

v.t.

bef. 900; Middle English (adjective, adjectival); Old English tōh; compare Dutch taai, German zäh(e)

tough ′ly, adv.
tough ′ness, n.

'toughness' also found in these entries (note: many are not synonyms or translations):

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