TV series example of the word

The Big Bang Theory Season 1, Episode 14
Time-travel joke. It's not... Never mind.

Breaking Bad Season 3, Episode 9
And Hank, okay? Hank's got enough on his mind right now.

The Big Bang Theory Season 7, Episode 12
Never mind, she's gone.

Game of Thrones Season 1, Episode 6
Have you lost your mind?

Game of Thrones Season 8, Episode 4
I worry about her state of mind.