insoluble
/ɪnˈsɑljəbəl/ adjective C2- That cannot be dissolved. · Petroleum is largely insoluble in water.
- That cannot be solved.
- That cannot be explained. · Near-synonyms: unexplained, mysterious; see also Thesaurus:incomprehensible, Thesaurus:mysterious
- That cannot be broken down or dispersed.
From the library
It is a most insoluble mystery.”
However, I will only say at the present stage that your problem does not appear to me to be insoluble, and that you may expect to find us at Victoria at two o'clock."
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