inattentive
Definitions
Not paying close attention to something; heedless or negligent.
Failing to show proper courtesy or consideration toward others.
Examples
The inattentive driver failed to notice the red light and narrowly avoided a collision.
Because the student was inattentive during the lecture, he struggled to complete the assignment.
An inattentive waiter forgot to bring our drinks, leaving us waiting for nearly twenty minutes.
Synonyms
distracted negligent absent-minded heedless preoccupied unmindful remiss