Inseparable /(?)/

In·sep·a·ra·ble

Inseparable

a.
  1. Not separable; incapable of being separated or disjoined.
    The history of every language is inseparable from that of the people by whom it is spoken.
    — Mure.
    Liberty and union, now and forever, one and inseparable.
    — D. Webster.
  2. Invariably attached to some word, stem, or root; as, the inseparable particle un-. (Gram.)