Antonyms for the phrase "took one breath away" would include words such as unimpressive, underwhelming, mundane, ordinary, and unremarkable. These words suggest a lack of excitement, surprise or awe, and a general sense of disappointment. They are the opposite of what one would feel when something truly astounding takes their breath away. Instead, they imply a sense of monotony and predictability that fails to impress. These antonyms remind us that not everything can be exceptional and that often great things are truly rare and valuable. We should cherish and appreciate them when they do happen, as they truly are one in a million.