Whit (noun)

1. A very small amount; a jot.
2. A small or insignificant thing.

Origin:

From the old english word "hwit" meaning "white".

Examples:

1. He didn't care a whit about the consequences.
2. She didn't know a whit about cooking.
3. I don't care a whit about what people say.
4. You haven't changed a whit since I last saw you.
5. She doesn't know a whit about politics.