discombobulated I heard it when I was nine, I think. It makes me feel like I'll get lost half way through saying or typing it, or life will interfere and drag me away. It's that magic kind of word where the semantic meaning matches the feeling as you say it.
Ah, wait. Words that aren't used that often.... Well then behoove.
True story. My first writing job was for a professor studying how people learn words. List vs story. He gave me lists and lists of words rarely used (unless you were a fantasy writer/reader LOL) to write into short stories. Then he had his test subjects read them and provide definitions, studying that vs list learning. I love saying, in an uptight high class with a nasual tange, "It behooves us..."