inexcusable

adjective

in·​ex·​cus·​able ˌi-nik-ˈskyü-zə-bəl 

: impossible to excuse or justify

inexcusable rudeness

inexcusableness noun

inexcusably

ˌi-nik-ˈskyü-zə-blē 

adverb

Synonyms of inexcusable

• unacceptable
• unforgivable
• unjustifiable
• outrageous
• unpardonable
• indefensible

Examples of inexcusable in a Sentence

spitting at a teacher is inexcusable behavior and will be severely punished

Recent Examples on the Web

This claim seeks to hold the Defendants accountable for their inexcusable failure to protect [the victim], resulting in her profound suffering and the birth of her child under traumatic circumstances. —Mike Hellgren, CBS News, 8 May 2026

After her March 4 arrest, a representative called her actions inexcusable and said that ideally, the arrest would lead to overdue change in her life. —Andrew Dalton, Fortune, 4 May 2026

The same goes for Humbert Humbert from Vladimir Nabokov’s controversial novel Lolita, a pedophile with a silver tongue who conjures up excuses for his inexcusable actions. —Big Think, 29 Apr. 2026

Which is inexcusable, because Bridges — like Towns — is in one of the worst scoring seasons of his NBA career. —Kristian Winfield, New York Daily News, 24 Apr. 2026

Word History

Etymology

Middle English, from Latin inexcusabilis, from in- + excusabilis excusable

First Known Use

15th century, in the meaning defined above

Rhymes for inexcusable

• diffusible
• excusable
• infusible
• reusable
• unusable
• fusible
• usable

Kids Definition

inexcusable

adjective

in·​ex·​cus·​able ˌin-ik-ˈskyü-zə-bəl 

: too bad to be excused : not justifiable

inexcusable rudeness

inexcusably

-blē 

adverb