insurmountable

adjective

in·​sur·​mount·​able ˌin(t)-sər-ˈmau̇n-tə-bəl 

: incapable of being surmounted : insuperable

insurmountable problems

insurmountably

ˌin(t)-sər-ˈmau̇n-tə-blē 

adverb

Synonyms of insurmountable

• insuperable
• unconquerable
• invincible
• unstoppable
• indomitable
• unbeatable
• invulnerable
• impregnable
• bulletproof
• undefeated
• armored

Examples of insurmountable in a Sentence

They were faced with several insurmountable obstacles.

the familiar story of the underdog who ultimately triumphs despite insurmountable odds

Recent Examples on the Web

Even when Florida’s lead was insurmountable, Golden was conscious of when to play Rioux because of his inability to keep up with the pace of the game and maintain endurance. —Edgar Thompson, The Orlando Sentinel, 30 Apr. 2026

LeBron James carried the Lakers to a historically insurmountable 3-0 lead in the best-of-seven first-round series against the Houston Rockets. —Los Angeles Times, 28 Apr. 2026

Change can seem impossible, our problems insurmountable. —Literary Hub, 27 Apr. 2026

The early hole proved insurmountable for a new-look Mets lineup that’s missing Francisco Lindor (calf) and Jorge Polanco (Achilles/wrist). —Peter Sblendorio, New York Daily News, 26 Apr. 2026

Word History

First Known Use

1690, in the meaning defined above

Rhymes for insurmountable

• accountable
• demountable
• uncountable
• countable
• unaccountable

Kids Definition

insurmountable

adjective

in·​sur·​mount·​able ˌin(t)-sər-ˈmau̇nt-ə-bəl 

: incapable of being surmounted