1) Alert 2) Argus-eyed 3) Attentive 4) Awake 5) Aware 6) Careful 7) Cautious 8) Mindful 9) Observant 10) On alert 11) Ononesguard 12) Onthewatch 13) Wakeful 14) Watchful 1) Alert 2) Argus-eyed 3) On watch 4) Open-eyed 5) Wakeful 6) Watchful 
Vigilant can refer to: == See also == ...[yacht] Vigilant was the victorious United States defender of the eighth America`s Cup in 1893 against British challenger Valkyrie II. Vigilant was designed by Nathanael Greene Herreshoff and built in 1893 by the Herreshoff Manufacturing Company of Bristol, Rhode Island. She was Herreshoff`s first victorious America`s Cup defender design. =...
• (a.) Attentive to discover and avoid danger, or to provide for safety; wakeful; watchful; circumspect; wary.
Vig'i·lant adjective [ Latin vigilans , - antis , present participle of vigilare to watch, from vigil awake: confer French vigilant . See Vigil .] Attentive to discover and avoid danger, or to provide for safety; wakeful; watchful; circumspect; wary. 'Be sobe...
member of a vigilance committee 
HMS Vigilant was a British Valentine Class destroyer of 1710 tons displacement launched in 1943. HMS Vigilant was powered by two Admiralty 3-drum type boilers providing a top speed of 34 knots. She was armed with four 4.7 inch guns; four 40 mm anti-aircraft guns; two 20 mm anti-aircraft guns and eight 21-inch torpedo tubes arranged in two quadruple...
[SAT terms] carefully observant or attentive[Lesser known words] carefully observant or attentive[Lexical terms] carefully observant or attentive