King-sized is an adjective typically associated with large or oversized items, but there are several antonyms for this phrase that denote smaller sizes. For example, petite, tiny, minuscule, small, and undersized are all words that imply compact and limited dimensions. Similarly, diminutive, puny, and slight describe objects that are small in stature, while miniature refers to replicas or models of larger objects. Additionally, the word moderate can be used as an antonym for king-sized, connoting a size that is neither too small nor too large, but just right. Overall, the antonyms for king-sized vary in their intensity and degree of size, making them useful for describing a range of items and spaces.