naughty

The word 'naughty' has a moralistic origin rooted in the concept of worthlessness. It evolved from the Middle English 'naught', meaning "nothing" or "evil," which itself came from Old English 'nāwiht' (no thing). By the late 14th century, 'naughty' described a person or action possessing no moral worth, essentially being "wicked" or "evil." Over centuries, its severity softened considerably, shifting from describing serious moral failings to denoting trivial misbehavior in children or playful indecency in adults. This etymological journey reflects a common linguistic pattern where a term for absolute negation ("nothing") develops into a label for poor quality or bad conduct, which then undergoes semantic bleaching to a milder, often humorous sense.

The word is a simplex form derived from the Middle English 'naught', meaning "nothing, evil". It is not productively composed of separable modern morphemes.