cancerous

adjective3

1. •
   Relating to or affected with cancer.

   • On Sunday at five they operated to remove the cancerous kidney. — 2002
2. •
   (figurative) Growing or spreading rapidly to the point of harm.
3. •
   (slang, offensive) Extremely unpleasant; detestable.

   • I love this show, but the fanbase is so toxic and cancerous.