The word "un-limitednesses" can be considered complex and may not have many synonyms in English. However, some options for words that come close in meaning include boundlessness, infinity, endlessness, immensity, and vastness. These words all convey the idea of something that has no end or limit. Additionally, other related synonyms may include expansiveness, openness, generosity, and largeness. These words can refer to both physical size or quantities as well as abstract concepts such as creativity or possibilities. While "un-limitednesses" may not be a common word, utilizing synonyms and related words can help to communicate similar ideas and concepts effectively.