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insoluble
mastery UK /ɪnˈsɒljʊbəl/ US /ɪnˈsɑljəbəl/adjnoun
card 1 of 10 · context meaning
Which meaning of 'insoluble' best matches its use in the sentence?
The cause of the strange lights in the sky is an insoluble enigma.
card 1 of 10 · context meaning
Which meaning of 'insoluble' best matches its use in the sentence?
The cause of the strange lights in the sky is an insoluble enigma.