Which preposition is very common with Disappointed with or by or in? [closed]
We tend to use "disappointed in" when speaking on a personal level about an individual or a group of people. It points to being disappointed by their character, commitment, or attitude which may have been revealed by an action, rather than the specific action itself.
We use "disappointed by" when referring to specific details or things which have caused us to be disappointed.
So, for example, we might say:
I'm very disappointed by this hotel.
BUT:
I'm very disappointed in the hotel management.