The word "inanenesses" is quite obscure, and as such, there are not many synonyms for it. However, the easiest alternative would be to replace it with "meaninglessness" or "emptiness," as they convey a similar sense of nothingness. Other possible synonyms could be "insipidity," "tediousness," or "vapidness," which all suggest a lack of interest or excitement. Alternatively, the term "banality" could be used to describe something that lacks originality or creativity. Though not widely used, "inanenesses" can be replaced with a variety of more commonly used words to better communicate the intended meaning.