Mindblowing is a word used to describe something that is incredible or astonishing. While there are no exact antonyms for this word, there are several other phrases that can be used to convey the opposite meaning. These phrases include "mediocre," "routine," "ordinary," "unspectacular," and "boring." These are just a few examples of antonyms to describe something that is not very impressive. If you are looking for words to describe something that is unremarkable or not impressive, there are several antonyms that you can choose from. It's important to remember that the opposite of mindblowing might not necessarily mean bad or negative; it simply means that the thing in question is not particularly memorable.