Driving

My brother and I went to the gas station to put some gasoline in the car. My bro pushed the wrong button and opened the trunk instead of opening the lid of the gas tank. I told him to close the trunk and he got out of the car and checked if the trunk was open but he was careless and did nothing, he got in the car and after driving one block the dashboard was blinking that meant the trunk was open so he parked the car and I got out to close the trunk.
Could you tell me the attitude of people like that? It's like lazy, procrastinator, something like that. Can someone help me with it?