Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
nonfunctional is an adjective meaning "not having or performing a function". It carries 2 recorded senses.
not having or performing a function
not performing or able to perform its regular function
“a malfunctioning valve”
Definitions, synonyms and semantic relations for nonfunctional come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.