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

But each alternative scenario encountered insurmountable theoretical limitations. — Robert Lea, Space.com, 29 July 2026

Or maybe the next generation of the monarch’s friends will find further innovations to defeat problems that now seem insurmountable. — Vann R. Newkirk Ii, The Atlantic, 28 July 2026

Overcoming human psychology may be the most insurmountable chore when implementing technology. — Joe McKendrick, Forbes.com, 27 July 2026

Fifty points isn’t an insurmountable gap for Russell to overcome. — Madeline Coleman, New York Times, 21 July 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