sappy

The word "sappy" originates from the Old English sæp, referring to the vital juice or fluid circulating in plants. The literal sense, "full of sap," emerged by adding the adjectival suffix -y, directly describing the juicy, often immature, state of wood or plants. Over time, this concrete meaning of being lush with fluid was metaphorically extended in the 19th century to describe human emotions. The logic of the metaphor likens excessive, often mawkish, sentimentality to the overly abundant and sometimes unrefined fluid of a young plant, leading to the modern abstract sense of foolishly sentimental.

Structure: sap (fluid) + py (adjective suffix) - sap: From Old English sæp, meaning "vital fluid of a plant, juice." Of Germanic origin. - py: A variant of the adjective-forming suffix -y, from Old English -ig, meaning "characterized by, full of."