Indissoluble
Indissoluble , adjective
[Latin indissolubilis: compare French indissoluble. See In- not, and Dissoluble, and compare Indissolvable.]
1.
Not dissoluble; not capable of being dissolved, melted, or liquefied; insoluble; as, few substances are indissoluble by heat, but many are indissoluble in water. — Boyle
2.
Incapable of being rightfully broken or dissolved; perpetually binding or obligatory; firm; stable, as, an indissoluble league or covenant.
To the which my duties
Are with a most indissoluble tie
Forever knit.