inseparably

from WordNet (r) 3.0 (2006)

inseparably
    adv 1: without possibility of separation; "these two are
           inseparably linked" [ant: {separably}]

from The Collaborative International Dictionary of English v.0.48

Inseparably \In*sep"a*ra*bly\, adv.
   In an inseparable manner or condition; so as not to be
   separable. --Bacon.
   [1913 Webster]

         And cleaves through life inseparably close. --Cowper.
   [1913 Webster]