Antonyms for the term "fancy up" are words that express the opposite meaning of dressing up, decorating, embellishing or adding elegance to something. These words suggest making something more simple, plain, and natural. The antonyms of "fancy up" include words such as dress down, strip, simplify, remove, undress, unadorned, unembellished, and unpretentious. The antonyms for "fancy up" suggest a more casual and laid back approach to appearance or presentation, rather than an elaborate or ornate one. They connote a sense of comfort, homeliness, and practicality that are not found in the elaborate decor or fashion accessories that come with "fancying up.