Indissoluble
INDIS'SOLUBLE, adjective [Latin indissolubilis; in and dissolubilis, from dissolvo; dis and solvo, to loosen.]
1. Not capable of being dissolved, melted or liquefied, as by heat or water. Few substances are absolutely indissoluble by heat; many are indissoluble in water.
2. That cannot be broken or rightfully violated; perpetually binding or obligatory; as an indissoluble league or covenant. The marriage covenant is indissoluble except in certain specified cases.
3. Not to be broken; firm; stable; as indissoluble friendship; indissoluble bands of love.