1. watchful - Adjective
2. watchful - Adjective Satellite
Full of watch; vigilant; attentive; careful to observe closely; observant; cautious; -- with of before the thing to be regulated or guarded; as, to be watchful of one's behavior; and with against before the thing to be avoided; as, to be watchful against the growth of vicious habits.
Source: Webster's dictionarycaught by a couple of alert cops Source: Internet
alert enough to spot the opportunity when it came Source: Internet
constantly alert and vigilant, like a sentinel on duty Source: Internet
insomniac old people Source: Internet
insomniac nights Source: Internet
lay sleepless all night Source: Internet