Fancy, technical, or more formal words for something not working include dysfunctional, inoperable, defunct, non-functional, impaired, compromised, incapacitated, malperforming, non-operational, or out-of-service. These professional terms are frequently utilized in technical reports, corporate maintenance documentation, engineering specifications, and formal customer service communications to describe equipment, software, or machinery that has failed to operate according to its required performance standards.
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