Bruteforce use a dictionary of words. So use a password with no words. example {#.#--#.#}_GLLo--->>69 {Mixture of Uppercase and lower case and symbols and numbers}
But as a previous poster said, if you get keylogged, NO password is strong enough. Or if you webcam is not covered, and your keystrokes streamed, via cam and logged, hmmm well you f$%^.
So cover those cams guys and girls.

I'm curious about keylogging. What happens if you use a password manager? Like, does it just give hackers "CMD+V or CTRL+V"? Auto form filling?
My password generator is currently set for 23 characters. How long until somebody comes up with something to break that?
-W
In theory an attacker could see what is in your clipboard at that moment in time, and your previous clipboards would likely remain accessible for some amount of time (until the memory is overwritten).
If an attacker is able to install a keylogger then they would likely be able to get your encrypted file containing all of your passwords, so the attacker could simply keylog your password to decrypt your password, then use that to get all of your other passwords