The quality or condition of being defective; the state of having faults, flaws, or failures.
From 'defective' (Latin 'defectus' plus '-ive') plus English suffix '-ness' (state or quality). This creates an abstract noun from an adjective.
Product recalls often cite 'defectiveness' as the legal and technical reason—when Tesla recalls a million cars or Tylenol gets pulled from shelves, 'defectiveness' is the formal term that triggers lawsuits and investigations.
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