likely to be understood or enjoyed by only a few people with a special knowledge or interest (Oxford)
very unusual and understood or liked by only a small number of people, especially those with special knowledge (Cambridge)
A programme of music for everyone, even those with the most esoteric taste. (Oxford)
Specialist dictionaries may be required to understand some of the more esoteric texts. (Oxford)
She has a somewhat esoteric taste in clothes. (Cambridge)
esoteric taste
esoteric texts
esoteric taste in clothes
Hidden
Inner
Secret
Simple
Open and clear
Esotericism