Englishfor English speakers
critical
Adjective
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A critical person always finds faults in things or people.
Her parents were critical of her dress.
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Very important.
It's critical that my package arrives on time.
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Badly injured.
He got hit by a car and is in critical condition.
alert
Adjective
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To be alert is to be awake; attentive
alert
Noun
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An alarm.
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A notification; something that is observed.
alert
Verb
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To alert is to bring notice to; warn.