undiagnosed

/ˌʌnˌdaɪəɡˈnoʊst/
adjective
  1. Not identified or recognized as a particular disease or condition by a medical professional.
    • He suffered from undiagnosed diabetes that was only discovered during a routine checkup.
    • The child's learning difficulties went undiagnosed until she started school.
    • Many people live with undiagnosed high blood pressure for years.
  2. Not identified or understood; not having been analyzed or explained.
    • The team's undiagnosed communication issues hurt their performance.
    • Undiagnosed software bugs can lead to system crashes.
    • The car had an undiagnosed engine problem that caused it to stall randomly.