alert

Part of speech: adverb

Alertly.

Part of speech: noun

Alertness.

Part of speech: adjective

Keenly watchful; on the lookout; ready for sudden action; also, lively; nimble.

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Usage examples "alert":

  1. " And I will venture to say," spoke Mr. Beckley, in the course of his after dinner address, on this occasion, " that whatever the future has in store for our friends, they will be found active and alert in time of play, in time of work or in time of danger." - "The Auto Boys' Mystery", James A. Braden.
  2. A shadow passed across her face, and instantly she was sitting up, alert and excited. - "Ronicky Doone", Max Brand.
  3. It was evident that he feared something, and every man was on the alert. - "Bob the Castaway", Frank V. Webster.