When you want to express that something is of poor quality or considered worthless, you may use the word "rubbished." However, there are several other synonyms that can be used in its place. Some of these include "disparaged," "condemned," "criticized," "belittled," "denounced," "disdained," "dismissed," "vilified," and "derided." Each of these words carries a slightly different connotation, but all convey the idea that something is not valued or esteemed. By using a varied vocabulary, you can add depth and nuance to your writing or speech, making your expressions more interesting and engaging.