Critical can mean very important or necessary, especially at a key moment. It can also mean finding faults or carefully judging the good and bad points of something.
From Greek *kritikos* “able to judge, discerning,” from *krinein* “to separate, decide.” It moved from the idea of judging to describing situations where judgment is extremely important.
When doctors say a patient is in ‘critical condition,’ they mean the situation is at a dangerous turning point—right from the same root as *crisis* and *criteria*. Being ‘critical’ in thinking doesn’t mean being negative; it means being a skilled judge instead of a passive sponge.
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