extrinsic not forming an essential part of a thing or arising or originating from the outside; "extrinsic evidence"; "an extrinsic feature of the new building"; "that style is something extrinsic to the subject"; "looking for extrinsic aid"
essential basic and fundamental; "the essential feature"
unalienable,
inalienable incapable of being repudiated or transferred to another; "endowed by their Creator with certain unalienable rights"
built-in,
inbuilt,
inherent,
integral,
constitutional existing as an essential constituent or characteristic; "the Ptolemaic system with its built-in concept of periodicity"; "a constitutional inability to tell the truth"
intrinsic -
situated within or belonging solely to the organ or body part on which it acts; "intrinsic muscles"
internal happening or arising or located within some limits or especially surface; "internal organs"; "internal mechanism of a toy"; "internal party maneuvering"
