Definition of alertness in US English:



  • The quality of being alert.

    ‘a lack of mental alertness’
    ‘nothing could escape the steel trap of my alertness’
    • ‘Travelers to such destinations practice extra alertness, precaution and prudence.’
    • ‘Fire has caused £30,000 damage to a woollen waste mill, and it could have been worse but for the alertness of a teenage girl.’
    • ‘Anything related to Taiwan's survival should be heeded with special alertness.’
    • ‘Nonetheless, he said, police would maintain a high degree of alertness.’
    • ‘Clydebank looked as though they had done enough for another valuable point, but they reckoned without the alertness of Alan Neil.’
    vigilance, awareness, watchfulness, attentiveness, attention, circumspection, wariness, chariness, heedfulness, canniness, discretion, prudence
    quick-wittedness, quick thinking, quickness of mind, sharpness, quickness, keenness, perceptiveness, responsiveness, agility, acuteness, acuity, shrewdness, astuteness, intelligence, insight, presence of mind
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