Antonyms of adj nonfunctional

2 senses of nonfunctional

Sense 1
nonfunctional (vs. functional) -- (not having or performing a function)

functional (vs. nonfunctional) -- (designed for or capable of a particular function or use; "a style of writing in which every word is functional"; "functional architecture")
        => structural -- (affecting or involved in structure or construction; "the structural details of a house such as beams and joists and rafters; not ornamental elements"; "structural damage")
        => utilitarian, useful -- (having a useful function; "utilitarian steel tables")

Sense 2
malfunctioning (vs. functioning), nonfunctional -- (not performing or able to perform its regular function; "a malfunctioning valve")


Similarity of adj nonfunctional

2 senses of nonfunctional

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

Sense 2
malfunctioning (vs. functioning), nonfunctional -- (not performing or able to perform its regular function; "a malfunctioning valve")
       => amiss (predicate), awry (predicate), haywire, wrong (predicate) -- (not functioning properly; "something is amiss"; "has gone completely haywire"; "something is wrong with the engine")
       => bad, defective -- (not working properly; "a bad telephone connection"; "a defective appliance")
       => out of whack -- (out of balance or out of adjustment; "the front wheel of my bicycle is out of whack")
       => run-down -- (having the spring unwound; "a run-down watch")