The antonym for "trans parent" is "opaque." Opaque is defined as something that is not clear and does not allow light to pass through. It is the opposite of transparency, as it creates a sense of opacity that obscures views or objects hidden behind it. This can be countless things, from windows in buildings, glassware, or even colloquial expressions. While transparent emphasizes the idea of clarity and openness, opaque means the opposite, emphasizing the need for privacy or concealing information. Knowing these antonyms can help you use language more effectively and describe things with the right words.