Definition of alertness in US English:

alertness

noun

  • The quality of being alert.

    ‘a lack of mental alertness’
    ‘nothing could escape the steel trap of my alertness’
    • ‘Anything related to Taiwan's survival should be heeded with special alertness.’
    • ‘Travelers to such destinations practice extra alertness, precaution and prudence.’
    • ‘Nonetheless, he said, police would maintain a high degree of alertness.’
    • ‘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.’
    • ‘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
    View synonyms

Pronunciation

alertness

/əˈlərtnəs//əˈlərtnəs/