blithe

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
1

adj carefree and happy and lighthearted

“was loved for her blithe spirit”
Synonyms:
blithesome, light-hearted, lighthearted, lightsome
cheerful
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”
Synonyms:
unconcerned
lacking in interest or care or feeling

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