esoterically

/ˌɛsəˈtɛrɪkli/
adverb
  1. In a way that is intended for or understood by only a small group of people with special knowledge.
    • The author wrote esoterically, assuming readers already knew the basics of quantum physics.
    • The instructions were written esoterically, making them useless for beginners.
    • He spoke esoterically about the symbols in the painting, confusing most of the audience.