unresolvable

US /ˌʌn.rɪˈzɑːl.və.bəl/
UK /ˌʌn.rɪˈzɑːl.və.bəl/
1.

không thể giải quyết được

(of a problem or disagreement) not able to be solved or ended:

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Generally, these kinds of problems rarely turn out to be unresolvable.