insoluble

1 ENTRIES FOUND:
insoluble /ɪnˈsɑːljəbəl/ adjective
insoluble
/ɪnˈsɑːljəbəl/
adjective
Britannica Dictionary definition of INSOLUBLE
1 
formal : not able to be solved or explained
2 
technical : not able to be dissolved in a liquid — opposite soluble