"I can’t believe he did that - I’ve never seen______ bad behavior!"
If there are two choices: "such" and "such a," which one is correct?
I personally think both are correct but have slightly different meaning which I couldn't figure out.
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I can’t believe he did that - I’ve never seen such bad behavior!
Here you don't use an article because you are using behaviour in its uncountable sense – referring to his behaviour in general.
You would use an article if you are referring to a specific behaviour:
The gorilla adopted a dominant stance. This was a behaviour I had not seen before.