Seasonless is a word that implies a lack of distinction between seasons, which can be useful in certain contexts. However, there are many alternatives to this word that offer slightly different connotations and shades of meaning. For example, "evergreen" implies a timeless quality that doesn't rely on the changing of the seasons, while "perennial" connotes a sense of enduring vitality. "Timeless" and "year-round" are also good synonyms for seasonless, emphasizing the idea that something is always relevant or available. Whatever the case, each of these options offer a unique way to convey the idea that something is unaffected by the passage of time or the changing of the seasons.