i don't care

This is pretty obvious. If you don't know what this means, either English isn't your language, or you are just an idiot. Either way, I don't care.

synonyms include:
I DON'T GIVE A FUCK
I DON'T GIVE A SHIT
I DON'T GIVE A DAMN

hey, don't you have a girlfriend. dude, i don't care.

I don't care

Not caring about the randomness of what Areli is about to tell you

Areli: My best friend is really bald headed

Jay: I don't care ...

I don't even

A phrase originating on the internet used to express complete and utter shock or not knowing what to say

Person 1 : OH MY GOD A CAT IS PULLING A WATERMELON OUT OF A SPACESHIP
You: OMG WHUT I DON'T EVEN

i don't care

To not have feeling for.

I don't care if he dies

I don't want it

The only phrase that was given to Jon Snow in the eighth season of Game of Thrones TV Show. Best spoken in a British accent like "I donn wont ot"

Me: Hey Jon, suck my dick.
Jon: I don't want it

i don't know

the foundation of a relationship

what are you lookin at? i don't know! what were you just talkin about? i don't know!

i don't give

A contraction of "I don't give a (fill in expletive here).

1: Dude, that kid was talkin some mad shit about you.
2: Man, I don't give. He's just a shit anyway.