extraneous, immaterial, impertinent, orthogonal -- (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")
extraneous -- (not essential; "the ballet struck me as extraneous and somewhat out of keeping with the rest of the play")
extraneous, foreign -- (not belonging to that in which it is contained; introduced from an outside source; "water free of extraneous matter"; "foreign particles in milk")
external, extraneous, outside -- (coming from the outside; "extraneous light in the camera spoiled the photograph"; "relying upon an extraneous income"; "disdaining outside pressure groups")
(Sound)
