There are several antonyms for the term "Human T Cell Leukemia Virus II." These antonyms refer to conditions, diseases, or viruses that are completely different from HTLV-II, either in terms of their biological structure, symptoms, or impact on human health. Some of the common antonyms for HTLV-II include Hepatitis B Virus, Herpes Simplex Virus, Human Immunodeficiency Virus (HIV), Influenza Virus, and Measles Virus. While HTLV-II can cause chronic infections and lead to a rare form of leukemia, these antonyms can cause a wide range of symptoms, from mild flu-like illnesses to severe, life-threatening conditions like cirrhosis, liver cancer, and AIDS.