abstruse
🇺🇸
/əbˈstruːs/
🇬🇧
/əbˈstruːs/
not easy to understand because it involves complex ideas or language
The professor's lecture was so abstruse that only a few students could follow it.
교수님의 강의가 매우 난해해서 몇몇 학생만 이해할 수 있었습니다.