WordNet 3.0 Copyright © 2006 by Princeton University.
- 1. alert (vs. unalert), watchful, argus-eyed, open-eyed, vigilant, wakeful, fly, heads-up, wide-awake, lidless, sleepless, awake, lively, wary
- usage: engaged in or accustomed to close observation; "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty"
- 2. insomniac, sleepless, watchful, awake(predicate) (vs. asleep)
- usage: experiencing or accompanied by sleeplessness; "insomniac old people"; "insomniac nights"; "lay sleepless all night"; "twenty watchful, weary, tedious nights"- Shakespeare
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See also: watchful (Dictionary)