The term 'not great' can be described in four different ways, each with four letters. The first is 'OKAY, ' which means satisfactory but not particularly impressive. The second is 'BLAH, ' which is a slang term for something that is boring or uninteresting. The third is 'so-so, ' which is another way of saying that something is mediocre. The fourth is 'EXECRABLE, ' which is an adjective meaning extremely bad or of very poor quality.