The adjective blithe used to mean happy and carefree, but over time it has also come to describe someone who isn't paying attention the way they should.

If you have a blithe disregard for authority, you might just smile vaguely when a teacher is yelling at you and continue writing on the lockers with a Sharpie. If you're dancing to music while driving, and pass blithely through a red light, chances are you will be pulled over and given either a ticket or a lecture.

Definitions of blithe

adj carefree and happy and lighthearted

“was loved for her blithe spirit”
blithesome, light-hearted, lighthearted, lightsome
being full of or promoting cheer; having or showing good spirits

adj lacking or showing a lack of due concern

“spoke with blithe ignorance of the true situation”
lacking in interest or care or feeling

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