The phrase "were turned on to" implies gaining an interest in or experiencing something new. Its antonyms include phrases like "lost interest," "got bored with," or "were turned off from." These suggest a lack of interest or enthusiasm towards something, or even repulsion from it. Another opposite phrase is "never discovered," which implies a lack of knowledge or exposure to something in the first place. "Refused to try" could also be an antonym, indicating a conscious decision to avoid or reject something new. Overall, the antonyms for "were turned on to" convey a sense of disinterest, disengagement, or avoidance of new experiences.