Русско-англо-русский юридический словарь

Gross negligence is a legal concept which means serious carelessness. Negligence is the opposite of diligence, or being careful. The standard of ordinary negligence is what conduct one expects from the proverbial "reasonable person." By analogy, if somebody has been grossly negligent, that means they have fallen so far below the ordinary standard of care that one can expect, to warrant the label of being "gross." Prosser and Keeton describe gross negligence as being "the want of even slight or scant care", and note it as having been described as a lack of care that even a careless person would use. (Wikipedia)

A 91-year-old woman died after suffering a broken leg due to the "gross negligence" of a care home nurse, a court has heard. (BBC News)