Lack of Care or Consideration

to not do things in order

Aren't you putting the cart before the horse by deciding what to wear for the wedding before you've even been invited to it?

to make an attempt to do something difficult without having the requirements or means to do so

The important thing about cooking is not to try and run before you can walk.

to lose the good alongside the bad in an attempt to dispose of the bad

Are you sure that we are not throwing the baby out with the bathwater in dealing with this?

used to say that a person is not interested or concerned about someone or something at all

I could not care less about celebrity gossip; it's just not important to me.

used when a person is not concerned about something or someone

You can starve to death for all I care.I am not giving you any more of my leftovers.

to care or consider something important

I haven't given a shit for the show ever since they killed off my favorite character.

to not consider a thing or person while planning and fail to prepare a way to deal with them as a result

He thought he'd get away with his crime, but he reckoned without the FBI agents.

to decide to do something without considering its consequences

Tony accepted the project without realizing how much time it would take; he always dives in headfirst!

to allow a situation or issue to continue without intervention, hoping it become better or resolved in the future

Don't panic about the low sales - let it ride for a while and see if business picks up.