"Careless behavior" refers to actions or decisions that are done without paying attention, thought, or consideration for the potential consequences or impact they may have. It implies a lack of caution or care in one's behavior. Full definition
If you are in an auto accident caused by reckless or careless behavior of the other driver file a compensation claim as soon as possible. (koushanlaw.com)
So it's important for parents to make sure that faulty equipment, improper surfaces, and careless behavior don't ruin the fun. (kidshealth.org)
Individuals, employers, manufacturers and corporations are all capable of causing harm through careless behavior. (cochranfirm.com)