What does "scatterbrain" mean?

A flighty, disorganized or forgetful person.

Scatterbrain

Common synonyms include: absentminded person, absentmindedness, airhead, airheads, birdbrain, disorganization.

noun

noun ·Rare ·Advanced level

Noun

1
A flighty, disorganized or forgetful person.
"Vivian is so VERY late! Where has that scatterbrain been all this time?"
2
a flighty and disorganized person wordnet

""Oh no! I left my umbrella on the train." "You are a scatterbrain!""

From scatter + brain.