Synonyms of impermissible

Adjective

1. impermissible (vs. permissible), forbidden, out(predicate), prohibited, proscribed, taboo, tabu, verboten, unmentionable, untouchable, intolerable#1, unbearable#1, unendurable

usage: not permitted; "impermissible behavior"

2. impermissible, inadmissible (vs. admissible)

usage: not allowable

Definition and meaning of impermissible (Dictionary)