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critical can be used to describe saying something is bad or not as good as it should be.
It can be quite formal.
He was critical of the training session.
He said it was boring.
Many employees were unhappy with his critical comments.
Critical can also be used to mean you think something is very important, particularly to the way things might happen in the future.
Your financial support is critical to the success of the project.
Will you take the job?
It's a critical decision.
Finally, critical can mean something is extremely serious or dangerous.
After the crash, the driver was in a critical condition.
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