the word 'trendy' is a modern 20th-century formation, built upon the older noun 'trend.' the noun 'trend' itself originates from the middle english verb 'trenden,' meaning to turn or revolve, which can be traced back to old english and proto-germanic roots related to circular movement. by the mid-1800s, 'trend' had evolved to signify a general direction or tendency, particularly in statistical or social contexts. the addition of the productive adjective-forming suffix '-y' directly to this noun created 'trendy,' literally meaning "characterized by the current trend," to describe something or someone adhering to the latest fashion.

Structure: trend (general direction) + y (adjective suffix) trend: from middle english 'trenden' (to turn, roll, revolve), of germanic origin; the noun sense developed in the 19th century. in this word, it functions as the core root meaning a prevailing tendency or direction. y: a native english suffix of germanic origin, used to form adjectives meaning "characterized by" or "full of."