A very cool concept and format, plus a couple of great entries in the dictionary.
I think the power of this book lies with its relatability and the idea that it is describing feelings you've experienced but not had a word for. However, I found the bulk of the concepts covered unrelatable or even disagreed with the ideas that were put forward, although to be fair a lot of them were casual musings.
In particular, I was not a fan of the recurring theme that life just generally gets worse (I thought I'd heard every variation of this, but the idea that being born is the peak of your life and it's all downhill from there was at least original even if it was a pessimistic lie). And a lot of other thoughts and definitions in here that I had no personal resonance with just left me confused.
The collages and the etymologies were very cool, including the little historical titbits within the origin stories, and the book overall is very creatively inspiring.

The Dictionary of Obscure Sorrows delves the depths of our shared human experience in an attempt to put to word some of our common thoughts and emotions. Have you ever wondered what to call that “odd interval of blankness you feel after something big happens to you but before you feel the resulting emotional reaction?” (tarrion) Or when you make an excuse to “rationalize a disappointing outcome?” (wellium) This short work is part philosophy and part etymology; both fun and reflective. Koenig poetically explicates the emotions we feel, but often don’t have the words for.

Wanky as hell, but I liked it. Wasn’t the best collection of words or poetry I’ve read, but it really describes the human experience.

I feel like I’ve been waiting for this big all my life. I thought there might be a word for that feeling in there, but there wasn’t, so I know my task!