esoteric
US /ˌes.əˈter.ɪk/
UK /ˌes.əˈter.ɪk/
1.
intended for or likely to be understood by only a small number of people with a specialized knowledge or interest.
:
•
The book was full of esoteric references that only a few scholars could understand.
•
His lectures often contained esoteric jokes that went over most people's heads.