1. in a way that expresses disapproval or finds fault
2. in a way that involves careful judgment about the good and bad qualities of something
3. in a way that is extremely important or at a crucial point

Examples

• The teacher looked at his work critically and suggested improvements.
• She examined the evidence critically before reaching a conclusion.
• The patient is critically ill and needs immediate surgery.
• This decision will critically affect our company’s future.
• The reviewer critically analyzed the new movie’s plot and acting.
• Water levels are critically low after the drought.
• He spoke critically of the government’s new policies.