abstruse
英 [?b'stru?s]
美[?b'strus]
- adj. 深奥的；难懂的
英英释意
- 1. difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge;
- "the professor's lectures were so abstruse that students tended to avoid them"
- "a deep metaphysical theory"
- "some recondite problem in historiography"