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toughness

/ (ˈtʌfnɪs) /
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noun
the quality or an instance of being tough
metallurgy the ability of a metal to withstand repeated twisting and bending, measured by the energy in kilojoules needed to break itSee brittleness (def. 2), softness (def. 2)
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Which of the following nouns has an irregular plural form?
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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