Evil Intent
Malice, Ill Will
noun
Someone with bad energy is someone who has evil intent, malice, or ill will. Hopefully you don't have too much 悪気.
The reading itself has a lot of 悪気 with all the exceptions it has. The 悪 part is read like 悪い. Then, 気 is rendaku'd. What an evil reading. Just think "what's the most evil reading I can come up with?" when you see this word. Then you should hopefully be able to read it.
ごめんなさい、悪気はなかったんです。
I'm sorry, I didn't mean any harm.
悪気がないのは分かってるけど、今のはヒドすぎるよ。
I know you didn't mean any harm, but what you just said was too harsh.
悪気がない方がタチが悪いよ。ナチュラルにやってるんだから、直しようがないもん。
The problem is that when there's no ill intent, it's more insidious. Because it's done naturally, there's no way to fix it.