Synonyms of insoluble in English:

insoluble


See definition of insoluble

adjective

1‘we must face the fact that some problems are insoluble’

SYNONYMS
unsolvable, insolvable, unable to be solved, without a solution, unanswerable, unresolvable
unfathomable, impenetrable, unexplainable, inscrutable
baffling, puzzling, perplexing, enigmatic, obscure, mystifying, mysterious, inexplicable

2‘these minerals are relatively insoluble’

SYNONYMS
not soluble, indissoluble, incapable of dissolving