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

These were insurmountable issues with less than six months to get the special on screen, even if post-production would have been shortened by the absence of an international partner. —Jake Kanter, Deadline, 11 June 2026

Hopefully not insurmountable ones, and the biggest needs to be making Marathon a success. —Paul Tassi, Forbes.com, 11 June 2026

This quiet movie still packs a mighty punch—a timeless lesson in the power of empathy and nobility to melt seemingly insurmountable differences. —Time, 10 June 2026

The 12-1 deficit was insurmountable but not the 8-1 score heading into Monday’s continuation. —Gary Bedore, Kansas City Star, 8 June 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