The term "dreamed-up" implies something that is fanciful or imaginary. Its antonyms, on the other hand, are words that connote reality, concrete ideas, and factuality. Some antonyms for "dreamed-up" include "real," "genuine," "authentic," "factual," "practical," and "credible." These words describe things that are tangible or existent in the physical realm. They carry the connotation of being verifiable and grounded in truth. Hence, if something is not "dreamed-up," it means it is based on fact and reality. Using antonyms for "dreamed-up" can provide clarity and accuracy when conveying a message, particularly in non-fictional writing or when presenting factual information.