extrinsic

adjectives

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"
antonym
is similar to
associated by chance and not an integral part
"poetry is something to which words are the accidental, not by any means the essential form"- Frederick W. Robertson; "they had to decide whether his misconduct was adventitious or the result of a flaw in his character"
is similar to
added or derived from something outside; not inherent
"an adscititious habit rather than an inherent taste"
is similar to
not contained in or deriving from the essential nature of something
"an economic theory alien to the spirit of capitalism"; "the mysticism so foreign to the French mind and temper"; "jealousy is foreign to her nature"
is similar to
coming from the outside
"extraneous light in the camera spoiled the photograph"; "relying upon an extraneous income"; "disdaining outside pressure groups"
is similar to
not essential
"the ballet struck me as extraneous and somewhat out of keeping with the rest of the play"
see also
not basic or fundamental