“Eudaemonic” developed from the Greek words “eudaimonikos” and “eudaimōn,” both of which mean “happy.” As with many English words, there’s a lot of crossover between Greek and Latin here. The Latin root “eu-” means “well” or “good.” It forms many words to describe pleasant things, such as “euphoria” (“intense happiness”), “euphony” (“a pleasant sound”), “eupeptic” (“related to good digestion”), “euphemism” (“a pleasant word substituted for a harsher term”), and “eurythmic” (“in harmonious proportion”).