Over-grown refers to something that has grown too much, too large or too dense, which can be a problem in certain contexts. Antonyms for over-grown are words that describe the opposite, including shrunken, stunted, or dwarfed. Shrunken implies that something has decreased in size or volume, while stunted suggests that growth has been hindered or restricted. Dwarfed indicates that something is exceptionally small or undersized compared to its typical size or potential. Other antonyms for over-grown might include trimmed, pruned or neatened, implying that the excess growth has been removed or controlled. Depending on the context, different antonyms for over-grown may be more suitable.