The term "overgrown" typically refers to something that has grown beyond its intended size or boundaries. As such, its antonyms are words that convey the opposite meaning, namely, that something is well-trimmed, maintained, or controlled. Some potential antonyms for "overgrown" could include "trimmed," "pruned," "kept," "controlled," "manicured," "tidied," and "neatened." These words all imply that the subject in question is under proper management and not allowed to grow unchecked. By using these antonyms, we can convey a sense of order and refinement that contrasts with the wild and unkempt character of something that is overgrown.