The Collaborative International Dictionary of English v.0.48:
Inalienably \In*al"ien*a*bly\, adv. In a manner that forbids alienation; as, rights inalienably vested. [1913 Webster]WordNet (r) 3.0 (2006):
inalienably adv 1: in an inalienable manner; "this property is held inalienably"