IPA: /ˌʌn.rɪˈzɒ.və.bəl/
KK: /ʌnˈrɛzəvəbəl/
Something that cannot be solved or fixed.
The conflict between the two parties seemed unresolvable after many discussions.
Unresolvable → It is formed from "un-" (meaning not) and "resolvable" (from Latin "resolvere", meaning to loosen or solve). The word "unresolvable" means not able to be solved or loosened.
Think of something that cannot be 'loosened' or 'solved' — 'un-' means not, and 'resolvable' comes from a word that means to solve.