Preventable failures (bad): these happen when someone fails to follow a clearly established process. They were entirely preventable.
Complex failures (bad): these happen due to complex and often subtle interactions between agents in the system that ultimately lead to error. These might have been preventable with better processes and/or greater psychological safety.
Intelligent failures (good): these are failures that are the regular result of doing your work. An R&D department, for example, will fail continuously as unrealistic projects are shut down. In an environment where intelligent failure is the norm, failure to fail is, in itself, a failure.