Being and up are two words with multiple antonyms depending on context. Being can mean existence, essence or nature, and some antonyms of this word are nonexistence, nonentity, or nothingness. Up, on the other hand, can mean above or higher, and some antonyms for it are down, below, or lower. Up can also mean alert, excited or motivated, and antonyms for this definition are apathetic, indifferent or lethargic. Overall, the antonyms for being and up vary depending on context and the specific meaning of these words in a particular sentence or situation.