Was heißt »Leichtsinn« auf Englisch?

Das Substantiv Leichtsinn lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Tom kann Marys Leichtsinn nicht länger ertragen.: Tom can't put up with Mary's carelessness any longer.
Das ist der höchste Leichtsinn.: This is the height of frivolity.

Let us not attribute to malice and cruelty what may be referred to less criminal motives. Do we not often afflict others undesignedly, and, from mere carelessness, neglect to relieve distress?
The fire originated from carelessness.
His thick black wavy hair was swept back with deliberate carelessness.
Tom cursed himself for his carelessness.
Tom admitted that the accident was due to his carelessness.
Tom admitted that it was due to his carelessness that the accident had happened.
That accident was due to his carelessness.
That accident is a good example of his carelessness.
She was ashamed of herself for her carelessness.
Her carelessness gave rise to the accident.
His carelessness cost him a broken leg.
He reproached me for carelessness.
Many accidents arise from carelessness.
Accidents arise from carelessness.
This mistake is due to his carelessness.
This accident resulted from the carelessness of the driver.
The forest fire occurred through carelessness.
The accident resulted from his carelessness.
The accident happened through his carelessness.
The failure is due to his carelessness.

Charaktereigenschaft:: character attributes; character trait; trait of character

Übermut:: arrogance; boisterousness; bravado; cockiness; exuberance; high spirits; overweening confidence; presumption; wantonness