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Longman Dictionary of Contemporary English
impermissible
adjective
EXAMPLES FROM OTHER ENTRIES
▪ The conduct of the officers in this case was impermissible.
EXAMPLES FROM CORPUS
▪ Codes of conduct were beginning to emerge and a range of permissible and impermissible subjects was being informally drawn up.
▪ I consider that such doctrine would be dangerous and impermissible.
▪ To switch off the respirator otherwise is impermissible.
The Collaborative International Dictionary
Impermissible

Impermissible \Im`per*mis"si*ble\, a. Not permissible.

Douglas Harper's Etymology Dictionary
impermissible

1814, from assimilated form of in- "not, opposite of" (see in- (1)) + permissible.

Wiktionary
impermissible

a. Not permissible; not to be permitted or allowed.

WordNet
impermissible
  1. adj. not permitted; "impermissible behavior" [ant: permissible]

  2. not allowable

Usage examples of "impermissible".

When, say, galley proofs were censored, the offending material was returned to the publisher with blue-penciled passages to be altered or deleted along with a standard form that simply indicated the paragraph or paragraphs of the ten-item Press Code that these impermissible passages violated.

We had just arrived at the delicate transition from astronomy, mathematics, and physics to the sciences of language and history, and the leader was a virtuoso in the art of setting traps for eager beginners like us and luring us on to the thin ice of impermissible abstractions and analogies.

Cuntish public-school drop-outs, dropped out for being too thick, having long hair or dirty boaters, unseaming new boys in multiple buggery, getting caught too many times with an impermissible number of hockey sticks up their bums.