There were insuperable obstacles, and the plan was abandoned.insuperablein‧su‧pe‧ra‧ble /ɪnˈsjuːpərəbəl◂ $ ɪnˈsuː-/ adjective formal 
There were insuperable obstacles, and the plan was abandoned. As usual, the hero was facing insuperable odds.
WORD ORIGINinsuperable
Origin:
1300-1400 French, Latin, from superare ‘to get over’, from super ‘above’EXAMPLES FROM OTHER DICTIONARIES
- The legal barriers are presently insuperable.
COLLOCATIONS FROM THE ENTRY There were insuperable obstacles, and the plan was abandoned. As usual, the hero was facing insuperable odds.COLLOCATIONS FROM OTHER ENTRIES
an insuperable difficulty or problem is impossible to deal with: There were insuperable obstacles, and the plan was abandoned. As usual, the hero was facing insuperable odds. (=one that it is impossible to find a solution to)· The problem does not present an insurmountable obstacle.· There are no insuperable obstacles to the purchase of the company.
COLLOCATIONS FROM THE CORPUSNOUN· If a child presents insuperable problems courts will interpret legislation in a commonsense way.· Of course this itself poses almost insuperable problems and would certainly be unprecedented if achieved.
There were insuperable obstacles, and the plan was abandoned. As usual, the hero was facing insuperable odds.