Here are some sentences to describe "obsession": She was so obsessed with him that she could not care less. He was obsessed with exploring the unknown and constantly pursuing higher realms. Her love for him had reached the point of obsession, and she was even willing to do some crazy things. He was so obsessed with it that he was desperate to complete it. He was so obsessed with music that he spent a lot of time practicing every day. He was so obsessed with his career that he even gave up his family. She was so obsessed with his idol that she would look at him every day without caring about anything. He was so obsessed with traveling that he would look for new places to explore every day. He was so obsessed with his game that he spent a lot of time playing it every day. She was so obsessed with his idol that she was willing to give up everything.