Japanese phrase
もう気にしません。 mō ki ni shi ma se n
Meaning
I will stop worrying about it.
When to use it
Says the speaker will not worry about it anymore. The polite wording shows a calm decision to move on from a small problem.
Example dialogue
テストの点、低かったね。 te su to no ten hiku ka tta ne
Your test score was low.
そうですね、もう気にしません。 sō de su ne mō ki ni shi ma se n
Yeah, I will stop worrying about it.