cavalier

adjective4 collocationsAvg. frequency: 6.1

Refers to a mindset of not taking important matters seriously.

Refers to a lack of concern for rules, safety, or others' feelings.

Used in the phrase 'in a cavalier fashion' to mean doing something in an offhand or dismissive way.

Refers to the act of rejecting something (like an idea or a person) without due consideration.