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insoluble
mastery UK /ɪnˈsɒljʊbəl/ US /ɪnˈsɑljəbəl/adjnoun
card 1 of 10 · definition
Which adverb most naturally collocates with 'insoluble' to mean 'apparently impossible to solve'?
Which adverb most naturally collocates with 'insoluble' to mean 'apparently impossible to solve'?