The quality or state of being stubborn, willful, or determined to follow one's own will without listening to advice.
From 'headstrong' + the noun-forming suffix '-ness.' This abstract noun became standardized in English by the 18th century to describe the character trait associated with obstinate behavior.
Psychologists and parents often note that the same 'headstrongness' that makes a toddler exhausting can make them an incredible entrepreneur or activist later in life—it's all about channeling that determination toward productive goals instead of just saying 'no' to bedtime.
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