insoluble

英 [ɪn'sɒljʊb(ə)l] 美[ɪn'sɑljəbl]

• adj. 不能解决的；[化学] 不能溶解的；难以解释的

1. (of a substance) not easily dissolved

2. admitting of no solution or explanation;

"an insoluble doubt"

3. without hope of solution;

"an insoluble problem"