Squattier, which means shorter and stockier in appearance, can have several antonyms depending on the context of the sentence. A few antonyms for squattier are taller, slimmer, and leaner. For instance, in a comparison of two people, one being squattier and the other leaner, leaner can be used as an antonym. Similarly, if comparing two buildings, using taller as an antonym for squattier would be appropriate. In general, squattier is often used to describe a more compact and sturdy appearance, so any antonym would likely describe a physique with less bulk or a more elongated shape.