unacceptable

/ˌʌnəkˈsɛptəbəl/
adjective
  1. Not good enough or not allowed according to a standard or rule.
    • His behavior at the meeting was completely unacceptable.
    • The quality of the work was unacceptable, so they had to redo it.
    • It is unacceptable to park in a handicapped spot without a permit.