Antonyms of adj decorative

1 sense of decorative

Sense 1
cosmetic, decorative, ornamental -- (serving an esthetic rather than a useful purpose; "cosmetic fenders on cars"; "the buildings were utilitarian rather than decorative")

INDIRECT (VIA nonfunctional) -> functional -- (designed for or capable of a particular function or use; "a style of writing in which every word is functional"; "functional architecture")

Similarity of adj decorative

1 sense of decorative

Sense 1
cosmetic, decorative, ornamental -- (serving an esthetic rather than a useful purpose; "cosmetic fenders on cars"; "the buildings were utilitarian rather than decorative")
       => nonfunctional (vs. functional) -- (not having or performing a function)