形容词

1. 不透明的;不透光的
If an object or substance is opaque, you cannot see through it.

2. 费解的；难懂的；晦涩的
If you say that something is opaque, you mean that it is difficult to understand.

1. not transmitting or reflecting light or radiant energy
impenetrable to sight

e.g. opaque windows of the jail
opaque to X-rays

2. not clearly understood or expressed

Synonym: unintelligible