Etymology
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scatterbrain (n.)

also scatter-brain, "thoughtless, giddy person; one incapable of serious, connected thought," 1790, from adjective scatter-brained (1764); see scatter (v.) + brain (n.). Scattered in the figurative mental sense is by 1620s, and the use of scattering for "mental distraction" dates to mid-15c. For the formation, compare scatter-good "spendthrift" (early 13c. as a surname).

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Definitions of scatterbrain

scatterbrain (n.)
a flighty and disorganized person;
Synonyms: forgetful person
From wordnet.princeton.edu