The phrase "blowing mind" often refers to something that is astonishing or has a profound effect on the viewer. Its antonyms would be words like "boring," "banal," "mundane," "unexciting," and "ordinary." Instead of being mind-blowing, these things are underwhelming and do not inspire any sense of awe or wonder. Other antonyms may include "predictable," "dull," "trite," "mediocre," and "ho-hum." Essentially, anything that fails to make an impact or elicit a strong emotional response would be an antonym for "blowing mind." While these things may have their merits, they simply cannot compare to the exhilarating feeling of experiencing something truly awe-inspiring.