esoteric
US /ˌes.əˈter.ɪk/
UK /ˌes.əˈter.ɪk/

1.
esoterico, arcano, riservato
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.
Il libro era pieno di riferimenti esoterici che solo pochi studiosi potevano capire.
•
His lectures often contained esoteric jokes that went over most people's heads.
Le sue lezioni contenevano spesso battute esoteriche che la maggior parte delle persone non capiva.