Antonyms or opposites of "blowing one's mind" could be staying grounded or unimpressed. It means that one is not overwhelmed or astonished by something. Other words that can be used as antonyms are common, predictable or mundane. These words suggest that an experience or thing does not leave a lasting impact on a person. It's the polar opposite of blowing one's mind. If someone says that a movie or concert was underwhelming, it means they expected more and were not impressed. Conversely, if a person says something was awe-inspiring or awe-struck, that's a good indication that their mind was indeed blown.
