When it comes to describing something that is not particularly impressive, there are plenty of synonyms to utilize in place of "nothing to brag about." For instance, one might use words like mediocre, average, ordinary, unremarkable, or uninspiring. Other options include phrases like "nothing special," "nothing remarkable," "nothing outstanding," or "nothing noteworthy." Additionally, you could say that something is simply "acceptable," "satisfactory," or "decent," or use phrases like "nothing to write home about" or "nothing to shout about." Ultimately, there are numerous ways to convey that something is unimpressive without resorting to the phrase "nothing to brag about".