scatterbrain - Lexagon

noun

Usage: informal

My sister is such a scatterbrain that she forgot her own birthday party.
Don’t be a scatterbrain – write down your appointments in a calendar.
The professor seemed like a scatterbrain, but he was actually brilliant.
She called herself a scatterbrain after losing her keys for the third time this week.
His scatterbrain tendencies made it difficult for him to keep track of deadlines.
Despite being a scatterbrain, she somehow managed to graduate with honors.