extraneous

Adjective

Synonyms: immaterial impertinent orthogonal foreign external outside

WordNet 3.0

Adjective (4)

not pertinent to the matter under consideration“an issue extraneous to the debate”“the price was immaterial”“mentioned several impertinent facts before finally coming to the point”Synonyms: immaterial impertinent orthogonal
not essential“the ballet struck me as extraneous and somewhat out of keeping with the rest of the play”
not belonging to that in which it is contained; introduced from an outside source“water free of extraneous matter”“foreign particles in milk”Synonyms: foreign
coming from the outside“extraneous light in the camera spoiled the photograph”“relying upon an extraneous income”“disdaining outside pressure groups”Synonyms: external outside

Webster's Dictionary (GCIDE)

Extraneous \Ex*tra"ne*ous\, a. [L. extraneus, from extra. See Extra-, Strange.] Not belonging to, or dependent upon, a thing; without or beyond a thing; not essential or intrinsic; foreign; as, to separate gold from extraneous matter. [1913 Webster]

Nothing is admitted extraneous from the indictment. --Landor. -- Ex*tra"ne*ous*ly, adv. [1913 Webster]