TOEFL insurmountable Definition Too great to be overcome or surpassed. Example "The challenge seemed insurmountable, but she refused to give up." Sign in to save TOEFL PDF — $25 ← insurgent insurrection → Study tips featuring "insurmountable" TOEFL Academic Vocabulary: Study by Topic Related words TOEFL brighten GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze