Usage patterns
〈事〉は不注意によるX is due to carelessness
The accident was due to his carelessness.
不注意な〈人〉a careless person
Careless people often forget things.
不注意で〈事〉to do something as a result of carelessness
I lost important documents due to carelessness.
〈人〉の不注意を指摘するto point out someone's carelessness
The boss pointed out his subordinate's carelessness.