I am wondering if there is a word for a product that does not meet the expected quality. Something like a 'below average product', but that does not feel correct so I was hoping for a better word.
In this specific case it is about a refurbished product, which is sold for a lower price than the regular product. So it is the same product (it is even tested to comply with standards), which could retail for a slightly lower price.
In context it could be something like this:
People assumed that the refurbished product was of ___ quality.
What would be a word for a product that is below the expected level of quality?