"Indissolubleness" is a word in ENGLISH

To fasten, as with a grapple; to fix; to join indissolubly.

The quality or state of being indissoluble.

Not dissoluble; not capable of being dissolved, melted, or liquefied; insoluble; as few substances are indissoluble by heat, but many …

Incapable of being rightfully broken or dissolved; perpetually binding or obligatory; firm; stable, as, an indissoluble league or covenant.

In an indissoluble manner.

Not dissolvable; incapable of being dissolved or separated; incapable o/ separation; perpetually firm and binding; indissoluble; as, an indissolvable bond …

Indissolubleness.

Fig.: To unite as if by the affections or the bond of marriage; to attach firmly or indissolubly.