不胜 + 感激／荣幸
exceedingly; more than one can say (of feelings)
Structure
（主语） 不胜 感激／荣幸／感慨／惋惜
What it means
不胜 (bùshèng, literally 'cannot bear') before a feeling word says the feeling is too great to hold: 'more grateful / honoured than I can say'.
How it is built
(Subject) + (对… +) 不胜 + two-syllable feeling word (感激, 荣幸, 感慨, 惋惜, 欣喜): 能请到您为本书写序，我们不胜荣幸 (We are deeply honoured that you will write the preface).
When to use it
Formal and polite, at home in letters and speeches; in speech say 特别感谢 or 非常荣幸. Keep apart: 不胜其烦 (can't stand the bother), 不胜酒力 (can't hold one's drink), V不胜V 'too many to …' (防不胜防, 5-17).
Watch out
No degree word before it and no object after it: ✗ 非常不胜感激 ✗ 不胜感激您 ✓ 对您不胜感激.
Examples
承蒙各位老师多年关照，不胜感激。
For all your kindness over the years, I am more grateful than I can say.
能请到您为本书写序，我们不胜荣幸。
We are deeply honoured that you have agreed to write the preface to this book.
回到离开了三十年的故乡，他不胜感慨。
Back in the home town he had left thirty years before, he was overcome with emotion.
Learn this in Lesson 255 · HSK 9+: 贺信与公函 (Congratulatory letters and official letters)
A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.
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