light-mindedness

At first, Peter was troubled by what he took to be his own light-mindedness.

Beneath his smiling light-mindedness there was a surprising depth of ... well, discretion.

Young then gave the gathering some words of advice, telling them to take care of their teams and to cease all music, dancing and "light-mindedness."

The dream-like scenes of the play, often mirroring each other, whirl in the endless vertigo of self-deception around the main character, Khlestakov, who personifies irresponsibility, light-mindedness, absence of measure.

To these self-appointed custodians of public morals it was even more appalling that those very classes who should in theory be the hope and backbone of republicanism were equally infected by the general tone of light-mindedness: