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

For a law purportedly designed to help people treat their mental health conditions, this is an inexcusable outcome. —Sakeena Trice, New York Daily News, 22 Jan. 2026

Particularly inexcusable was a delay of game to begin Miami’s final possession. —Barry Jackson, Miami Herald, 20 Jan. 2026

That’s inexcusable for a six-figure SUV like the Gravity, but unfortunately, not surprising in this modern era of incomplete new model launches. —Adam Ismail, The Drive, 14 Jan. 2026

Even that late-season stretch had its warts, as the Steelers blew a prime opportunity to clinch the division with an inexcusable Week 17 loss in Cleveland. —Jeff Zrebiec, New York Times, 5 Jan. 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