难溶
不溶解

Indissolvable \In`dis*solv"a*ble\, a. [Pref. in- not +
dissolvable. Cf. {Indissoluble}.]
Not dissolvable; incapable of being dissolved or separated;
incapable of separation; perpetually firm and binding;
indissoluble; as, an indissolvable bond of union. --Bp.
Warburton.