Synonyms of nonfunctional

Adjective

1. nonfunctional (vs. functional), nonstructural, cosmetic, decorative, ornamental, unserviceable

usage: not having or performing a function

2. malfunctioning (vs. functioning), nonfunctional, amiss(predicate), awry(predicate), haywire, wrong(predicate), bad, defective, out of whack, run-down

usage: not performing or able to perform its regular function; "a malfunctioning valve"