S: (adj) 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"
S: (adj) immaterial, indifferent ((often followed by `to') lacking importance; not mattering one way or the other) "whether you choose to do it or not is a matter that is quite immaterial (or indifferent)"; "what others think is altogether indifferent to him"