esoteric

US /ˌes.əˈter.ɪk/
UK /ˌes.əˈter.ɪk/
"esoteric" picture
1.

難解な, 秘教的な, 専門的な

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.
その本は、少数の学者しか理解できない難解な言及でいっぱいだった。
His lectures often contained esoteric jokes that went over most people's heads.
彼の講義には、ほとんどの人が理解できない難解なジョークがよく含まれていた。