Imperceivable means not able to be noticed or perceived. Its antonyms are perceivable, noticeable, evident, clear, and apparent. When something is perceivable, it can be observed, sensed or understood. If someone or something is noticeable, it attracts attention or draws one's notice. Evident refers to something that is clearly understood or seen. Clear means something that is free from cloudiness, obscurity, or ambiguity. Apparent means easily perceived or visible. These antonyms help us understand the contrast between something that is impossible to sense versus something that is very noticeable, clear, and understandable.