The antonyms for the word "most spreadout" are "compact", "concentrated", "gathered", and "clustered". These words describe something that is tightly packed, centrally located, or grouped closely together. For example, a compact city center may have all the stores and restaurants in one area, making it easy to navigate. A concentrated effort may bring a group of people close together to work on a specific task. A gathered audience may sit close to the stage to hear a speech or performance. And a clustered group of stars may form a constellation in the sky. While being spread out can have benefits, being compact or concentrated can also be advantageous in different situations.