IPA: /ˌɪn.dɪˈsɒl.jʊ.bli/
KK: /ɪnˈdɪsəˌluːbli/
In a way that cannot be broken apart or separated; permanently connected or united.
The two friends were indissolubly linked by their shared experiences.
Indissolubly → It is formed from "in-" (meaning not), "dissolubilis" (from Latin, meaning able to be dissolved), and the suffix "-ly" (meaning in a manner). The word "indissolubly" means in a manner that cannot be dissolved or broken apart.
Think of 'not able to be dissolved' — 'in-' means not, and 'dissolubilis' means able to dissolve.