The quality or state of being faulty or having defects and errors.
Derived from 'faulty' (adjective) plus '-ness' suffix, which creates abstract nouns from adjectives. The root traces back to Old French 'faulte' and Latin 'fallere'. The '-ness' suffix is one of English's most ancient ways of nominalizing adjectives, dating back to Old English times.
The suffix '-ness' is so powerful that we can add it to almost any adjective to create a noun describing that quality—'happy' becomes 'happiness', 'sad' becomes 'sadness'. This shows how English is like a word-building machine where relatively few rules can create thousands of words!
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