insoluble

1. ADJ An insoluble problem is so difficult that it is impossible to solve. 不能解決的

I pushed the problem aside; at present it was insoluble. 我把這個問題放到了一邊；目前它是無法解決的。

2. ADJ If a substance is insoluble, it does not dissolve in a liquid. 不溶解的

Carotenes are insoluble in water and soluble in oils and fats. 衚蘿蔔素不溶於水，但溶於油和脂肪。