The word "king-size" refers to something that is unusually large or grand in size. Its antonyms would include words such as "tiny," "small," "minuscule," "petite," and "undersized." These words reflect the opposite end of the spectrum from king-size, representing things that are smaller than average or modest in size. Other antonyms may include words like "average," "regular," or "medium-sized." These words indicate a neutral or standard size, which is neither exceptionally large nor exceptionally small. When searching for an antonym for king-size, it is important to consider the context in which it is being used and the specific connotation that is being conveyed.