Can't get to something you want? It must be inaccessible. If it were accessible, you wouldn't have any trouble finding it.
This word makes a lot of sense when you think about the word access, which is the ability to get at, use, or have something. Inaccessible things are out of reach. There are a lot of ways this word is used. A building without a ramp is often called inaccessible because people who use wheelchairs can't get in. People can be inaccessible too. If your doctor has office hours only one hour a day every two months, she's really inaccessible.