unconcernedpast participle Used as a participial adjective derived from the verb ‘unconcern’.
Rare/archaic transitive verb meaning to relieve of concern; also used reflexively in ‘unconcern oneself’.
He tends to unconcern himself with trivial matters.
Он склонен не беспокоиться о пустяках.
She decided to unconcern herself with the rumors.
Она решила не заботиться о слухах.