UNSOLVABLE
a.That cannot be solved; inexplicable.
unsolvable
un solv a ble |ˌənˈsälvəbəl -ˈsɑːlv -| ▶adjective not able to be solved. DERIVATIVES un solv a bil i ty noun
un |solv ¦able |ʌnˈsɒlvəb (ə )l | ▶adjective not able to be solved. DERIVATIVES unsolvability |-ˈbɪlɪti |noun