inseparate

First attested in 1550; borrowed from Late Latin insēparātus. By surface analysis, in- (“not”) +‎ separate.

inseparate (not comparable)

1. (rare) Not separate; together, united, undivided.
   • c. 1602 (date written), William Shakespeare, The Famous Historie of Troylus and Cresseid. […] (First Quarto), London: […] G[eorge] Eld for R[ichard] Bonian and H[enry] Walley, […], published 1609, →OCLC, [Act V, scene ii]:

     VVithin my ſoule there doth conduce a fight / Of this ſtrange nature, that a thing inſeparat, / Diuides more vvider then the skie and earth: […]

• “inseparate”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

• Persianate, spartaeine