不透明的

When we talk about things being opaque, we are usually describing their physical ability to block light. Think of a solid brick wall or a thick piece of wood; these are classic examples of opaque objects.

However, the word has a second life in our daily conversations. We often use it to describe ideas, legal documents, or complex explanations that are just too confusing to grasp. If someone gives you an answer that makes no sense, you might say their reasoning is quite opaque.

The word opaque traveled a long way to reach English. It comes from the Latin word opacus, which originally meant 'shaded' or 'dark.' It entered English through the French language around the 17th century.

Historically, it was used primarily in scientific contexts to differentiate between materials that allowed light to pass (transparent) and those that did not. Over time, writers began using it as a metaphor for things that are 'in the dark' regarding meaning, leading to its modern usage in politics and philosophy.

You will find opaque used in both scientific and professional settings. In science, you might hear about opaque materials or opaque fluids. In business or law, you might hear about opaque processes or opaque financial structures.

It is generally a formal word. While you might use it in casual conversation to sound smart, it is more common in written reports, news articles, and academic essays. Avoid using it for simple things; if you can see through a window, don't call it opaque!

While opaque itself isn't a core part of many idioms, it relates to concepts like: 1. Clear as mud (the opposite of clear). 2. In the dark (lacking information). 3. Behind closed doors (describing an opaque process). 4. Obscure the truth (making something opaque). 5. A black box (a system where the internal process is opaque).

Pronunciation: The word is pronounced oh-PAYK. The stress is on the second syllable. It rhymes with words like opaque, awake, and forsake.

Grammar: It functions as an adjective. You can use it before a noun (e.g., an opaque substance) or after a linking verb (e.g., the rules were opaque). It is not a noun, so do not say 'the opaqueness' unless you are being very technical; use 'opacity' for the noun form.