The Dictionary of Obscure Sorrows

The Dictionary of Obscure Sorrows is an English word-construction project by John Koenig, seeking to coin and define neologisms for emotions not yet described in language. The project was launched as a website and YouTube channel, but was later compiled into a printed dictionary in 2021. The entries include extensive constructed etymologies based on Koenig's own research on linguistics, with roots and suffixes taken from Latin, Germanic, and Ancient Greek sources in emulation of existing English terms. The website includes verbal entries in the style of a conventional dictionary, and the YouTube channel picks some of those words and tries to express their meaning more thoroughly in the form of video essays. The book takes from those previous places, so it has both dictionary style entries and some longer essays on specific words.

Koenig's terms are often based on what was described as "feelings of existentialism" and are meant to "fill a hole in the language", often from reader contributions of specific emotions. Some videos involve a large number of photographs, such as the video for Vemödalen, which uses an "almost exhausting—yet seamless—fusion of 465 similar photos from different photographers". Other videos are more personal, such as Avenoir, which involves a "collage of his own home movies to piece together an exploration of life's linearity".

The official book for the Dictionary of Obscure Sorrows was released by Simon & Schuster on November 16, 2021.