alert

a-lert · adjective

imported

Definitions

adjective

  1. 1.

    Quick to notice and respond; vigilant and aware.

  2. 2.

    A warning signal or state of heightened readiness.

  3. 3.

    To warn or make someone aware of danger or a problem.

Phrases & expressions

  • •
    on the alert — Watchful and ready for action.
  • •
    red alert — The most urgent warning level.
  • •
    amber alert — A public notification about a missing child.
  • •
    stay alert — To remain watchful and attentive.

Related words

Antonyms: drowsy, inattentive, unaware
See also: alarm, alerted, warning
Synonyms: attentive, vigilant, watchful

Etymology

From Italian all'erta ("on the watch"), from erta ("watchtower"), from erigere ("to erect"), from Latin erigere. First used in English in the late 16th century.