Indignant

to be /to feel/ indignant at smth ( it's like a reminder for me, not to forget, I saw this word already, but don't use that)

I'm raging too

I'm indignant/angered too

thank you both

We normally don’t use indignant in everyday language.

https://lingvolive.com/posts/1490949

Я не понимаю, что автор комментария там хотел этим сказать

To be honest, I don’t either. That’s why I asked — to see if it means something beside “very angry.”

I’m pissed off/mad as hell, too.

Is it really equal to "be indignant"?
Normally, we don't use "негодую" in everyday language too, except when talking in joking manner

*in a joking manner

*jokingly

They’re exactly equal to indignant.