adjective

irrelevant or unrelated to the subject being dealt with.

one is obliged to wade through many pages of extraneous material

irrelevant,immaterial,beside the point,not to the point,neither here nor there,nothing to do with it,not pertinent,not germane,not to the purpose,off the subject,unrelated,unconnected,inapposite,inappropriate,inapplicable,inconsequential,incidental,pointless,out of place,wide of the mark,peripheral,tangential