Noun
The quality or state of being tough.
Source: Webster's dictionaryAnyone who has a continuous smile on his face conceals a toughness that is almost frightening. Greta Garbo
To be gentle, tolerant, wise and reasonable requires a goodly portion of toughness. Peter Ustinov
You have to stick out the toughness of the business and form relationships with the people in it. Rocco DiSpirito
We must combine the toughness of the serpent with the softness of the dove, a tough mind and a tender heart. Martin Luther King Jr.
Concentration and mental toughness are the margins of victory. Bill Russell
I suppose there is a lot of toughness in me. Boy George