Synonyms of insuperable

insuperable

adjective

(ˌ)in-ˈsü-p(ə-)rə-bəl 

1

as in insurmountable

incapable of being defeated, overcome, or subdued

the building project ran into insuperable financial difficulties and had to be scrapped

Synonyms & Similar Words

• insurmountable
• unconquerable
• invincible
• impregnable
• unbeatable
• invulnerable
• unstoppable
• indomitable
• armored
• bulletproof
• undefeated
• unassailable
• inviolable
• untouchable
• unbreachable
• defended
• protected
• unbeaten
• shielded
• guarded
• safeguarded
• secure
• unconquered
• safe
• unbowed
• unsubdued

Antonyms & Near Antonyms

• vulnerable
• surmountable
• liable
• susceptible
• open
• unsafe
• vincible
• superable
• unprotected
• insecure
• unguarded
• weak
• exposed
• powerless
• helpless
• imperiled
• defenseless

2

as in impossible

incapable of being solved or accomplished

insuperable problems have arisen which make it very unlikely that we will ever finish this project

Synonyms & Similar Words

• impossible
• hopeless
• unlikely
• insoluble
• problematic
• unsolvable
• insolvable
• futile
• unattainable
• impractical
• unrealizable
• incredible
• undoable
• impracticable
• absurd
• inconceivable
• unworkable
• infeasible
• useless
• improbable
• unfeasible
• dubious
• unimaginable
• questionable
• unbelievable
• unusable
• unthinkable
• disputable
• implausible
• debatable
• ridiculous
• doubtful
• shaky
• fishy
• suspect
• suspicious
• far-fetched
• outlandish
• doubtable
• fantastic
• preposterous
• shady

Antonyms & Near Antonyms

• possible
• feasible
• soluble
• workable
• practical
• achievable
• reasonable
• attainable
• functional
• practicable
• applicable
• useful
• resolvable
• probable
• serviceable
• realizable
• doable
• usable
• likely
• conceivable
• working
• acceptable
• plausible
• credible
• believable

Example Sentences

Recent Examples of insuperable

Orban succeeded in this enterprise to what seemed like an insuperable level. — Melik Kaylan, Forbes.com, 28 Apr. 2026

Raise the stakes, place insuperable obstacles before the protagonist, have the protagonist somehow surmount them while becoming braver and better. — Adam Gopnik, New Yorker, 9 June 2025

Television’s tendency to play down to the masses — manipulating our individual needs for attention, for agreement, or simply to win — is an insuperable problem at this particular, shameless moment in pop culture. — Armond White, National Review, 16 Oct. 2024

This attitude, although understandable, creates an insuperable barrier to creating a better policy. — Alan S. Blinder, Foreign Affairs, 11 Dec. 2018

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