It didn't interest me a bit. = It didn't interest me one (single/little) bit.这丝毫引不起我的兴趣。

I'm not a bit interested in this movie. = I'm not the least bit interested in this movie.我对这部电影毫无兴趣。

That joke was not a/one bit funny. [=was not funny at all]那个笑话一点儿也不好笑。

We weren't a bit tired. [=we weren't tired at all]我们一点儿也不累。