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insurmountable

adjective
 
 
/ˌɪn.səˈmaʊn.tə.bl̩/ US  /-sɚˈmaʊn.t̬ə-/ formal

Definition

(especially of a problem or a difficulty) so great that it cannot be dealt with successfully: insurmountable difficulties This small country is faced with an insurmountable debt.Complicated and difficult to doDifficult to understand
(Definition of insurmountable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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