unrelated

adjective2

1. •
   Not connected or associated.

   • The holiday started with two unrelated mishaps.
   • I was having lunch with Jim the other day, who's just had his first kid. Oh, and on a completely unrelated note, there's a new cinema opened up in town.
2. •
   Not related by kinship.

   • He had the same surname as me, but we were unrelated.