- arcane
- obscure
- little known
- esoteric
- rarefied
- recherché
- difficult
- recondite
- puzzling
- hard
- enigmatic
- perplexing
- cryptic
- inscrutable
- complex
- Delphic
- involved
- complicated
- incomprehensible
- over/above one's head
- impenetrable
- unfathomable
- involute
- mysterious
- involuted
Example Sentences of Abstruse
1. The professor’s lecture was abstruse.
2. He explained the abstruse theory with ease.
3. Her writing is full of abstruse terms.
4. The subject became too abstruse for beginners.
5. They struggled with the abstruse concept.
6. The book covers abstruse philosophical ideas.
7. He enjoyed reading abstruse literature.
8. The math problem was abstruse to most students.
9. She simplified the abstruse material for the class.
10. The explanation was too abstruse to follow.
11. His argument was unnecessarily abstruse.
12. The article dealt with abstruse legal matters.
13. They debated an abstruse point of logic.
14. The topic was too abstruse for casual readers.
15. He avoided the abstruse parts of the text.
16. The theory seemed abstruse but was actually simple.
17. She found beauty in abstruse complexity.
18. The scientist gave an abstruse presentation.
19. Only experts could grasp the abstruse formula.
20. He struggled with the abstruse symbolism in the poem.