The term INFERIOR GRADE can be broken down into two crossword solutions: DEE (3 letters) and SECONDCLASS (11 letters). DEE is an informal term used to describe something of low quality or value. SECONDCLASS is a grade given to a student who has not achieved the highest level of academic performance. Inferior Grade, then, is a term used to describe something of low quality or value, or a grade given to a student who has not achieved the highest level of academic performance.