alert (n.)
alert (v.)
alert (adj.)
- active
- advertent
- agile
- agog
- alive
- animated
- apt
- assiduous
- attentive
- awake
- aware
- brainy
- bright
- brilliant
- buzz
- cant
- careful
- cautious
- clear-sighted
- clearheaded
- clever
- concentrated
- conscious
- decisive
- diligent
- earnest
- expeditious
- finical
- finicky
- frisky
- gay
- heedful
- horn
- immediate
- instant
- instantaneous
- intense
- intent
- keen
- knowing
- lively
- mercurial
- meticulous
- mindful
- nice
- niggling
- nimble
- observant
- observing
- open-eyed
- openmouthed
- prompt
- punctual
- quick
- quick-witted
- ready
- regardful
- sharp
- signal
- sleepless
- smart
- speedy
- spirited
- sprightly
- spry
- summary
- swift
- unblinking
- unsleeping
- up
- vigilant
- vivacious
- wakeful
- warning
- wary
- watchful
- wide-awake
