A2 adjective /ˈkeər.ləs/
Careless
achtslos; nachlässig; unaufmerksam; sorglos;
Meaning
not giving sufficient attention or thought to avoiding harm or errors; negligent; inattentive
Example
His careless driving caused a serious accident on the highway.
Sein achtsloses Fahren verursachte einen schweren Unfall auf der Autobahn.