His unconcern about the upcoming deadline frustrated the whole team.

The historian dismissed the rumor as unconcerning to the broader narrative, so he did not include it in his book.

Her unconcernment about the looming deadline surprised the entire team.

She remained unconcerned about the results, focusing instead on the next steps.

Her unconcerns about the company's direction were evident during the meeting.

Her unconcernedness about the deadline surprised everyone on the team.

He remained unconcern'd about the verdict, sipping tea as if nothing had happened.

She unconcernedly sipped her coffee while the meeting around her grew tense.