The antonyms for the phrase "got impression" would be "did not perceive," "missed the point," "failed to understand," or "wasn't affected." When we say we have "got an impression," we mean that we have formed a particular view or opinion based on what we have seen, heard, or experienced. However, if we did not perceive anything or missed the point, we would not have any impression. Similarly, if we failed to understand something or were not affected by it, we would not have any impression either. Therefore, the opposite of the phrase "got impression" would be not having any impression at all.