IPA: /oʊˈpeɪk/
KK: /oʊˈpeɪk/
Not able to be seen through; not transparent or clear.
The glass was opaque, making it impossible to see what was inside the box.
A substance that does not allow light to pass through, making it impossible to see through it.
The artist used an opaque paint to create a rich, dark background for the painting.
Opaque → It is formed from "ob-" (meaning against) and "caecus" (meaning blind). The word describes something that is against light, or in other words, not allowing light to pass through, hence it is 'blind' to visibility.
Think of something that is 'against' light ('ob-') and 'blind' ('caecus') — that's why opaque means not letting light through.