advertent agile agog alert alive all ears all eyes assiduous attentive awake aware bright careful clear-sighted clear-witted clearheaded concentrated conscious diligent earnest finical finicking finicky heedful intense intent intentive keen meticulous mindful nice niggling nimble observant observing on the on the alert on the job open-eared open-eyed openmouthed prompt qui vive quick ready regardful sharp sleepless smart unblinking unnodding unsleeping unwinking wakeful watchful wide-awake