The term blue-ribbon refers to the highest honor or distinction in a particular field. The opposite or antonym of this word would be substandard, mediocre or average. These terms do not represent exceptional quality or excellence in any way. Another antonym for blue-ribbon could be the word subpar, which represents something that is below the expected or desired standards. The term second-rate could also be an antonym, which means something that is inferior or of low quality. The opposite of blue-ribbon depends on the context in which it is used, but it is generally associated with negative connotations.