Insurmountable
/ˌɪnsəˈrmaʊntəbəl/
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Definition
(adj) Incapable of being passed over, surmounted, or overcome; insuperable
Sentence Examples
The odds were seemingly insurmountable but he overcame them to win the presidency.
No problem is insurmountable.
CEFR Practice Quiz
The problems facing the small company were ____, and it was forced to close down last month.