Abstruse (adjective)

Difficult to understand; profound and complex.

Origin:

From the latin abstrusus ("hidden, obscure"), from abstrudere ("to hide awa.y")

Examples:

1. The abstruse theories of the philosopher left many of his students bewildered.
2. The abstruse mathematics problem was only solved after many hours of intense study.
3. The abstruse nature of the poem made it difficult for many readers to fully appreciate its meaning.
4. The abstruse language of the legal document was hard for most people to comprehend.
5. The abstruse concepts in the lecture were only understood by a few members of the audience.