This word is a bit different. It’s not a “real word” (a topic worthy of its own blog post)—it was created by The Dictionary of Obscure Sorrows, a blog of invented words by John Koenig. Like any word, It’s begun to take on a life of its own; it’s been added to UrbanDictionary and passed around other internet sources as a “real word,” lending it some legitimacy. As The Dictionary of Obscure Sorrows aims to create words for feelings we feel but don’t have words for, and, because a word is nothing but a string of arbitrary letters with meaning attached (you can read more about what a “real word” is in relation to “sonder” here), it has arguably succeeded.
But anyway, a drabble.