Cast Iron Pan - I don’t cook enough to justify it. Girlfriend at the time thought it was a good idea, and she used it a bunch, but now it’s just in the cabinet probably rusting up.

Humidifier - It gets really dry in here and it was recommended as a solution to my dry eyes. But it’s a pain to clean and refill, so it mostly just sits there.

Robo vacuum - It wasn’t great at navigating the apartment, so I didn’t use its auto schedule thing. Then the cat hair overwhelmed it. It is languishing in the closet. I got some use out of it, at least, driving it around like an RC Car, but I ended up buying a more robust manual vacuum cleaner