black as pitch; impossible to see through
Opaque is a word that refers to something not being see through. Since wood is not see through, it cannot be called opaque.
Opaque
I can put the word opaque into a sentence. Alternatively, The wall is opaque.
Opaque can be used as an adjective and a noun.
Opaque.
Considering that transparency and opacity are opposites, yes. Something completely transparent is not at all opaque, and something completely opaque is not at all transparent. However, something which is 50% transparent is also 50% opaque, and something 25% transparent would be 75% opaque, and something 25% opaque would be 75% transparent. Transparency and opacity are at the opposite ends of the same scale.
That would be 'opaque'.
something unknow
It was hard to see through the opaque windows.
The word opaque has two syllables. (o-paque)
Something that is opaque does not allow light to pass through, making it difficult to see through or translucent. In a figurative sense, opaque can also refer to something that is difficult to understand or unclear.
Opaque means something is not clear or translucent and cannot be looked through.