
...would be that you end up a lonely,
BITTER old man with no progeny.
The Big Bang Theory Season 1, Episode 17

You BITTER, envious little man.
The Big Bang Theory Season 12, Episode 23

To the BITTER end!
Westworld Season 2, Episode 2

and I'm BITTER because my ex
got involved with my sister
Money Heist Season 1, Episode 6

you'd be less BITTER about him winning.
The Big Bang Theory Season 10, Episode 9