solipsistic
🇺🇸
/ˌsɑːlɪpˈsɪstɪk/
🇬🇧
/ˌsɒlɪpˈsɪstɪk/
Believing that only your own mind is sure to exist, and that everything else might not be real.
Some people might think that their own thoughts and feelings are the only things that truly exist, which is a solipsistic view.