Antonyms for the word "un-perceived" include perceived, noticed, recognized, observed, seen, heard, discerned, apprehended, detected, and acknowledged. When something is perceived, it is understood or interpreted correctly, and is no longer hidden or concealed. Being noticed means that something has caught your attention or has been brought to your awareness. Recognized means that you are familiar with something, have seen it before or can identify it easily. An observed phenomenon has been witnessed and can be explained accurately. Seeing something means that it is within sight, while hearing refers to the sense of hearing. Discerning something involves perceiving its nuances and details, while apprehending something is to understand it fully. Detecting something involves uncovering it, and acknowledging something is to admit or recognize its existence.