undetected

/ˌʌndɪˈtɛktɪd/
adjective
  1. Not noticed or discovered, especially when someone is trying to avoid being seen or found.
    • The spy managed to remain undetected for years.
    • A small leak in the pipe went undetected until the basement flooded.
    • The virus can stay undetected in the body for months.
What does "undetected" mean? | whatsthatwordmean | whatsthatwordmean