unconcerned
UK: ˌʌnkənˈsɜːnd | US: ˌʌnkənˈsɜːrnd
adj. not worried or anxious; indifferent
adj. not involved or interested in something
The word "unconcerned" combines the prefix "un-" (meaning "not") with the root "concern" (from Latin concernere, "to sift or mix," later evolving to mean "to relate to or affect"). The suffix "-ed" turns it into an adjective. Originally, "concern" implied a connection or involvement, so "unconcerned" logically developed to describe a lack of engagement or worry. The shift from literal "mixing" to emotional detachment reflects how language abstracts physical actions into mental states.
She remained unconcerned about the rumors spreading around the office.
His unconcerned attitude during the crisis surprised everyone.
The cat looked unconcerned as the dog barked loudly.
He was unconcerned with the details, focusing only on the big picture.
Despite the deadline, she seemed utterly unconcerned.