If I say:
- My room is moldy.
It can simultaneously give two descriptions
-its appearance and smell
How could I know, or be more specific about either its appearance or smell is meant to be presented in the sentence.
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If someone said to me as a native speaker that their room is mouldy, I would expect this to mean that they had seen mould on the walls. Of course, with visible mould also comes the smell, so that's implied.
You can be more direct with your verbs if you want to talk about the appearance or smell:
My room looks mouldy.
My room smells mouldy.
You could also choose to be more direct about what is mouldy, or how you know there is mould.
There is mould on the room's walls.
I've found mould behind a cupboard.