impermissible

adjective

im·​per·​mis·​si·​ble ˌim-pər-ˈmi-sə-bəl 

: not permissible

impermissibility

ˌim-pər-ˌmi-sə-ˈbi-lə-tē 

noun

impermissibly

ˌim-pər-ˈmi-sə-blē 

adverb

Synonyms of impermissible

• prohibited
• forbidden

Examples of impermissible in a Sentence

Such behavior is impermissible under the new guidelines.

an impermissible breach of etiquette

Recent Examples on the Web

Court records show that Sorsby has acknowledged making thousands of impermissible bets on pro and college sports totaling at least $90,000 during his time at Indiana, Cincinnati and Texas Tech. — ABC News, 15 June 2026

The board would be able to suspend or prohibit any investment found to be impermissible. — Garrett Downs, CNBC, 11 June 2026

Court records show that Sorsby has acknowledged making thousands of impermissible bets totaling at least $90,000 during his time at Indiana, Cincinnati and Texas Tech. — Stephen Hawkins, Chicago Tribune, 8 June 2026

Now, DeSantis and his legislative collaborators argue that their own 2022 map created a racial gerrymander, Broward County’s District 20, that’s impermissible under the federal Constitution. — Sun Sentinel Editorial Board, Sun Sentinel, 2 June 2026

Word History

First Known Use

1829, in the meaning defined above

Rhymes for impermissible

• admissible
• immiscible
• permissible
• transmissible
• inadmissible
• indivisible
• inexplicable
• miscible

Kids Definition

impermissible

adjective

im·​per·​mis·​si·​ble ˌim-pər-ˈmis-ə-bəl 

: not permissible

impermissibility

-ˌmis-ə-ˈbil-ət-ē 

noun

impermissibly

-ˈmis-ə-blē 

adverb

Legal Definition

impermissible

adjective

im·​per·​mis·​si·​ble ˌim-pər-ˈmi-sə-bəl 

: not permissible

impermissibly adverb