heady

The adjective 'heady' is a native English formation, directly built from the noun 'head' and the adjectival suffix '-y'. Its original, literal sense, now obsolete, was "headstrong" or "willful," directly linking a quality of the mind to the physical head. Over time, the meaning evolved to describe things that figuratively affect the head or senses, such as intoxicating drinks or powerful fragrances, which can cause lightheadedness or exhilaration. From this sensory meaning, it further extended to describe abstract situations or emotions (like success or power) that are so intense they are mentally intoxicating and can lead to rash, impulsive behavior, thus completing the journey from a concrete body part to a complex abstract adjective.

Structure: head + y - head: From Old English 'hēafod', meaning the upper part of the human body or the top/chief part of something. In this compound, it conveys the sense of "relating to the head" or "affecting the head." - y: A productive suffix from Old English '-ig', used to form adjectives meaning "characterized by" or "full of."