impermissible

Something impermissible isn't allowed. It's impermissible in every part of the U.S. to drive 100 miles an hour on the highway.

Things that are permissible are legal, authorized, or welcome — you are permitted to do them. The opposite of permissible is impermissible, which adds the "opposite" prefix im- to permissible, from the Latin permittere, "let, allow, grant, or permit." It's impermissible to bully other kids at school, or against the rules, and it's impermissible to steal a car, or against the law.

Definitions of impermissible
  1. adjective
    not permitted
    impermissible behavior”
    Synonyms:
    forbidden, out, prohibited, proscribed, taboo, tabu, verboten
    excluded from use or mention
    unmentionable
    unsuitable or forbidden as a topic of conversation
    untouchable
    forbidden to the touch
    intolerable, unbearable, unendurable
    incapable of being put up with
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    Antonyms:
    allowable, permissible
    that may be permitted especially as according to rule
    tolerable
    capable of being borne or endured
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  2. adjective
    not allowable
    Synonyms:
    inadmissible
    not deserving to be admitted
Word Family