Added 9 October 2026 malfunctioning adjective Categories: Describing WordsRare Words adjective ! Definition from WordNet 3.1, Princeton University. More about malfunctioning at Wordnik → Where our words come from → Not performing or able to perform its regular function. a malfunctioning valve Related Words: amissdefectivewrongbadnonfunctionaldeadrun-downdownawryhaywire Back to today's word