The quality of being erratic; a pattern or philosophy of erratic or unpredictable behavior or thinking.
From 'erratic' combined with the suffix '-ism', which typically denotes a system, belief, or characteristic behavior. This creates a more formal or philosophical noun than 'erraticness'.
When English speakers want to sound more formal or intellectual, they use '-ism' instead of '-ness'—'erraticism' sounds like a deliberate philosophy, while 'erraticness' just describes the quality of being unpredictable!
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