cavalier

1. ADJ If you describe a person or their behaviour as cavalier, you are criticizing them because you think that they do not consider other people's feelings or take account of the seriousness of a situation. 目空一切的; 漫不经心的[表不满]

The editor takes a cavalier attitude to the concept of fact checking. 该编辑对事实核查持漫不经心的态度。