INDISSOLUBLE
indissoluble
(adjective) used of decisions and contracts
insoluble, indissoluble
(adjective) (of a substance) incapable of being dissolved
Source: WordNet® 3.1
Etymology
Adjective
indissoluble (comparative more indissoluble, superlative most indissoluble)
Lasting; indestructible; not possible to dissolve, disintegrate or break up.
Source: Wiktionary
In*dis"so*lu*ble, a. Etym: [L. indissolubilis: cf. F. indissoluble.
See In- not, and Dissoluble, and cf. 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.
Shak.
Source: Webster’s Unabridged Dictionary 1913 Edition