The term 'EXTREMELY GOOD' can be described using three 8-letter, 9-letter, and 6-letter crossword solutions: FABULOUS, EXCELLENT, and SUPERB. These words are all adjectives used to describe something of high quality or that is particularly impressive. FABULOUS is an especially strong word, implying something that is extraordinary or even magical. EXCELLENT is a more general term, meaning something that is very good or of a high standard. SUPERB is also a strong word, suggesting something that is outstanding or remarkable. All three words can be used to describe something that is EXTREMELY GOOD.