sanguine

the word 'sanguine' has a vivid history rooted in the ancient theory of the four humors, which posited that bodily fluids determined a person's temperament. it derives from the latin 'sanguis', meaning 'blood', which itself may trace back to the proto-indo-european root h₁sh₂-én-, also related to blood. in medieval physiology, an excess of blood was believed to produce a ruddy complexion and a bold, hopeful, and passionate disposition. over time, the literal association with blood and redness became archaic, while the metaphorical link to a confident and optimistic outlook became the dominant modern meaning.

Structure: sanguin (blood) + e (adjective suffix) sanguin (from latin 'sanguis', meaning 'blood'); e (a common adjectival suffix in english, often derived from latin '-eus' or french '-in')