The term "shatterbrained" refers to someone who is forgetful, disorganized, and lacks focus. There are several synonyms that can be used to describe a person who is shatterbrained, such as absent-minded, scatterbrained, forgetful, distracted, and spacey. These words describe someone who tends to forget important details, loses focus easily, and has trouble staying organized. Additionally, words like flighty, impulsive, and capricious can also be used to describe someone who is shatterbrained, as they suggest a lack of forethought and planning. Regardless of the synonym used, someone who is shatterbrained may struggle to keep their thoughts and actions organized and focused.