scatterbrained

US /ˈskæt̬.ɚ.breɪnd/
UK /ˈskæt̬.ɚ.breɪnd/
"scatterbrained" picture
1.

disorganized and lacking in concentration

:
She's so scatterbrained that she often forgets her keys.
His scatterbrained approach to planning led to many mistakes.