I'm disappointed in your behavior.

svetlana14

Senior Member
Joined
Dec 5, 2013
Member Type
Interested in Language
Native Language
Ukrainian
Home Country
Ukraine
Current Location
Ukraine
Are these phrases and sentences colloquial? The idea is that a business partner is frustrated by the behaviour of his counterparty.

  • British:
    • I'm disappointed in your behavior.
    • I'm not happy with your recent actions.
    • I'm concerned about your recent performance.
    • I'm not sure I can continue working with you if this is how you're going to behave.
  • American:
    • I'm let down by your behavior.
    • I'm not pleased with your recent actions.
    • I'm worried about your recent performance.
    • I don't know if I can continue working with you if this is how you're going to act.
 
I'm not sure why you've separated them out into British English and American English. The only one I wouldn't use (in BrE) is "I'm let down by your behaviour". I don't find it natural at all. I might start with "I feel [very] let down ..." but not with "I'm". Also, if the two lists were supposed to reflect meaning, I wouldn't say that "disappointed" is the same as "let down".
I would use the other seven sentences.

Note that you misspelled "counterpart".
 

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