Was heißt »leichtsinnig« auf Englisch?

Das Adjektiv leichtsinnig lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Es war leichtsinnig von dir, den Schlüssel im Auto zu lassen.: It was careless of you to leave the key in the car.
Es war leichtsinnig von mir, so etwas zu tun.: It was careless of me to do something like that.
Man darf nicht leichtsinnig auf E-Mails von fremden Menschen antworten.: You can't just answer emails from people you don't know.
Es war leichtsinnig von mir, das Gas anzulassen.: It was careless of me to leave the gas on.
Sie sind sehr leichtsinnig, so etwas Wichtiges zu vergessen!: How careless you are to forget such an important thing!
Es war leichtsinnig von ihr, so etwas zu tun.: It was very careless of her to do such a thing.
Es war leichtsinnig von ihr, es zu vergessen.: It was careless of her to forget it.
Er ging leichtsinnig mit seiner Pistole um.: He was careless in handling his pistol.
Ich hätte dich nicht für so leichtsinnig gehalten!: I didn't think you'd be so careless.
Er gab zu, leichtsinnig gewesen zu sein.: He admitted he'd been careless.

Both rutting boars and sows with their young can be dangerous to the careless woodland rambler.
You're very careless.
I'm very careless.
It was careless of him to leave the door open.
That happened to you because you were careless.
Tom is a reckless driver, isn't he?
I admit I was careless.
I admit that I've been careless.
Tom was very careless.
I didn't think you would be so careless.
The sight of blood makes me feel queasy and lightheaded.
Why are people so careless?
How could you be so careless?
Whoever is careless with the truth in small matters cannot be trusted with important matters.
Tom was careless.
Tom is very careless.
Tom is careless, isn't he?
Tom is reckless, isn't he?
Tom is very reckless, isn't he?
That was very careless of you.