activeness, agility, attentiveness, briskness, carefulness, circumspection, heedfulness, liveliness, nimbleness, perceptiveness, promptitude, quickness, readiness, spiritedness, sprightliness, vigilance, wariness, watchfulness
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alert ( alerts plural & 3rd person present) ( alerting present participle) ( alerted past tense & past participle )
1 adj If you are alert, you are paying full attention to things around you and are able to deal with anything that might happen.
We all have to stay alert..., He had been spotted by an alert neighbour.
The drug improved mental alertness.
2 adj If you are alertto something, you are fully aware of it.
v-link ADJ to n
The bank is alert to the danger.
3 n-count An alert is a situation in which people prepare themselves for something dangerous that might happen soon.
Due to a security alert, this train will not be stopping at Oxford Circus.
4 verb If you alert someone to a situation, especially a dangerous or unpleasant situation, you tell them about it.
He wanted to alert people to the activities of the group... V n to n
I was hoping he'd alert the police. V n
6 If soldiers or police are on alert, they are ready to deal with anything that may happen.
on alert phrase PHR after v, v-link PHR
Soldiers and police have been put on alert.
7 If you are on the alertfor something, you are ready to deal with it if it happens.
on the alert phrase PHR after v, v-link PHR They want to be on the alert for similar buying opportunities.
red alert ( red alerts plural ) If a hospital, a police force, or a military force is onred alert, they have been warned that there may be an emergency, so they can be ready to deal with it. n-var
All the Plymouth hospitals are on red alert...
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