不好意思 的英文怎么说?

[1] don't want to be rude[2] uncomfortable
  embarrassed
  shy[3] feel obligated to do something
  feel bad[4] just being polite[5] back down

don't want to be rude = 不想看起來那麼無禮，也就指 "不好意思"，如:

I wanted to exit the parking lot first, but I don't want to be rude. So I let him exit first.

的中文意思就是:

雖然我想先開出停車場，但我不好意思這麼說，怕顯得無禮，所以我讓他先開出停車場。

uncomfortable 也是個貼切的字，有時候依情況翻譯，例如:

我不好意思一直去麻煩他做事 = I feel uncomfortable asking him for favors.

也可以用 don't feel comfortable，如以下:

I don't feel comfortable asking for favors. = 我不好意思麻煩別人做事

你也可以用 embarrassed，例如:

I didn't get you anything. I am so embarrassed. = 我沒有送你任何東西，感到有些不好意思(因為你有送我)

另外，embarrassed 可能含有 "丟臉" 的意思，例如:

I'm embarrassed asking my father for money.

指我不好意思跟爸要錢，是因為我認為有點丟臉。但是如果我說:

I'm uncomfortable asking my father for money.

就單純是指 "我跟爸要錢不舒服"，至於不舒服的原因不一定是丟臉，正如 "不好意思" 的原因也不一定是丟臉一樣。

別不好意思(例如鼓勵別人表明自己的意見) = Don't back down.