early 15c., opake, from Latin opacus "shaded, in the shade, shady, dark, darkened, obscure," of unknown origin. Spelling influenced after c. 1650 by French opaque (c. 1500), from the Latin. Figurative use from 1761. Related: Opaquely; opaqueness.
例文
1. The jargon in his talk was opaque to me.
彼の会話で使われている言葉は私にとって謎です。
2.The once clear mountain stream is now polluted and opaque .
かつては澄みきった山渓だったが、今では汚染されて濁っている。
3.The complex administrative arrangements render the decision-Making process somewhat opaque .
複雑な行政協商により、意思決定プロセスの透明性が高くならない。
4.The report was written in long, opaque sentences.
レポートの文は長くて分かりにくい。
5.You can always use opaque glass if you need to block a street view.