Noun. From German.
“An improvement to a situation, that actually makes the situation much worse”
German is known as an agglutinative language, similar to Finnish, in the way that it likes to combine many words together to make one, big, occasionally-really-hard-to-pronounce word (e.g. Rolltreppenbenutzungshinweise). Verschlimmbesserung can be used in so many situations nowadays, especially in the realm of technology. Just think of Facebook “updates…”