When someone is described as "harty," it means they are robust, strong, and healthy-looking. There are several synonyms for this word that can be used to convey a similar meaning. For example, "hearty" can be replaced with "vigorous," "sturdy," "thriving," or "buoyant." All of these words suggest a person or thing that is full of life and vitality, with a strong and resilient nature. Other synonyms for "harty" might include "robust," "heavy," or "substantial," all of which suggest a solid, weighty presence. Ultimately, identifying the right synonym depends on the context and the tone of the description, as well as the subtle nuances of meaning that different words can convey.