extraneous

adjective

1. 1

   coming from the outside

   extraneous light in the camera spoiled the photograph

   relying upon an extraneous income

2. 2

   not essential

   the ballet struck me as extraneous and somewhat out of keeping with the rest of the play

3. 3

   not pertinent to the matter under consideration

   an issue extraneous to the debate

   the price was immaterial

4. 4

   not belonging to that in which it is contained; introduced from an outside source

   water free of extraneous matter

   foreign particles in milk