La-dee-da is a term that describes something that is frivolous or overly fancy. Antonyms for la-dee-da would, therefore, be words that describe something that is practical, straightforward, or plain. Some possible antonyms for la-dee-da include words like practical, simple, down-to-earth, plain, unadorned, straightforward, functional, basic, and unpretentious. These words describe things that are not flashy, showy, or unnecessarily complicated. They are the opposite of la-dee-da, which is used to describe things that are considered to be pretentious, ostentatious, or overly fancy. By using these antonyms, we can talk about things that are more practical and grounded in the real world.