absent-minded

he's incredibly absent-minded and often forgets where he put his keys.

my absent-minded professor misplaced his research papers again.

she has an absent-minded habit of staring out the window.

due to his absent-mindedness, he missed the important meeting.

the absent-minded student left his lunch on the bus.

she's an absent-minded artist, always losing her paintbrushes.

he's so absent-minded that he walked into a lamppost.

an absent-minded glance revealed her nervousness.

the absent-minded driver left the car door open.

despite being brilliant, he's remarkably absent-minded.

she gave an absent-minded nod while listening to the lecture.