Your attitude always forestalls us from enjoying.
Does the above sentence make sense?
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Sign up to join this communityI don't think this is really a correct use of forestalls.
Forestalls means to take measures in advance to prevent something. An attitude is a disposition in the moment, so if it's attitude that is the problem, it would be strange for that to be premeditated.
I think what you want is hinders. Also, as mentioned by others, you can't end on "enjoying" as you did. I think this is what you want to say:
Your attitude hinders our enjoyment of what we are doing.
Replace "what we are doing" with the specific thing you are talking about.
As far as forestalls is concerned, yes, but you either need to say enjoyment or add the subject of the enjoyment:
Your attitude always forestalls our enjoyment.
Your attitude always forestalls us from enjoying Monopoly.
Edit: I believe forestalls works according to this definition:
4: to exclude, hinder, or prevent by prior occupation or measures