impermissible

/ɪmˌpɜːrmɪsəˈbɪləti/
adjective
  1. Not allowed or permitted; forbidden.
    • The use of cell phones during the exam is impermissible.
    • The company has a list of impermissible behaviors in the workplace.
    • It is impermissible to park in front of a fire hydrant.
Antonyms
What does "impermissible" mean? | whatsthatwordmean | whatsthatwordmean