Everybody's business is nobody's business.

It is irresponsible of you to break your promise.

It was irresponsible of him to break a promise.

You cannot count on her because she's too irresponsible.

She charged me with being irresponsible.

He was lazy and irresponsible. Thus, he was told to leave the company.

Don't try to duck out early. Where's your sense of responsibility?

I am alarmed by your irresponsible attitude.

Everybody's business is nobody's business.

What's everybody's business is nobody's business.

Everybody's business is nobody's business.

Hey, we're trying to have a serious discussion here so I'd appreciate it if you wouldn't butt in so irresponsibly.

The man charged me with being irresponsible.

I want to find out the source of this irresponsible rumor.

I'm surprised by her lack of responsability.