A shopkeeper was very cautious about the items in his shop. He was not letting anybody touch or check before buying those.
Is it right to say that he was very conservative in his approach?
I am aware of the dictionary meanings of the word conservative, and concede that it doesn't really work here. But in this example, I couldn't find a more suitable adjective to describe the shopkeeper. I did not find any similar examples on the internet, so I put this question here.
I would like a single-word adjective for a shopkeeper who is dishonestly cautious in order to hide reality of his substandard product