DictionarycavalierDismissive lack of concern
adjective

cavalier

kav-uh-LEER/ˌkævəˈlɪr/

showing little concern for something important

The woman takes a cavalier attitude toward safety atop the stepladder.

A woman perched unsafely on the top cap of a stepladder casually waves away another woman's visibly urgent concern about her footing.
Etymology

The horse-based formation originally named a horseman, then a knight or gentleman, sometimes disparagingly a swaggerer. The adjective shifted from “gallant, knightly” through “easy, offhand” to the modern sense of disdainful disregard.

In context

Insider2:43
EOD being risky cavalier cowboys there's maybe an association or an implication or something. That there's so many people with their name on the wall who died in combat because they were that way
How Bomb Disposal Experts Actually Work | Authorized Account | Insider

More examples

  • She resents their cavalier dismissal of her concerns.
  • The report criticizes a cavalier approach to public funds.
  • He gives a cavalier shrug when asked about the damage.

Similar words

dismissive
Emphasizes rejecting something as unworthy of consideration.
careless
Can result from inattention rather than confident disregard.