Become preoccupied is a term used to describe a state of mind in which one is overly focused on a particular thought or idea. It can be described as obsessing or fixating on something, which are both terms that have 6 letters. This state of mind can be caused by stress, anxiety, or other mental health issues. It can also be caused by an intense interest in a certain topic or activity. In either case, it can lead to a person becoming overly consumed with the thought or idea and having difficulty focusing on anything else.