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

The following year, after transferring to West Virginia, Kriisa would face a nine-game suspension for violating NCAA rules governing impermissible benefits while with the Wildcats. — Daniel Libit, Sportico.com, 6 July 2026

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

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