Which is worst ignorance or apathy?

Apathy.

If you are ignorant you do not know.
If you have apathy you know and do nothing.

I'd say apathy. At least with ignorance you can learn.

I don't know and I don't care.

I don't know and i don't care.

Apathy. By far.

Are either bad??
Not knowing isn't a bad thing neither is not being interested.

ignorance, because you live in your on bubble and don't bother finding out the truth about anything - which is worse than choosing not to care

Ignorance

Definitely ignorance.

Don't care