not essential; not belonging; superfluous
In the draft of your essay I have marked sections that I consider to be extraneous to your argument.
extra (outside of) (Latin)
Think of news channels. EXTRA+NEWS. In order to get TRP, news channels show irrelevant or unrelated things hence the news are most of the times EXTRANEOUS concentrate on extra + ne + ous. something that is extra is NOT ESSENTIAL (NE)