indissoluble

Permanent; binding.

Impossible to dissolve, disintegrate, or decompose.

Not dissoluble or dissolvable; incapable of being dissolved. See dissolve, 1, and solution.

Not dissoluble in force or obligation; not to be rightfully broken or violated; perpetually binding or obligatory; firm; stable.

Not dissoluble; not capable of being dissolved, melted, or liquefied; insoluble.