alert
I
(agile) adjective
alive, animated, expeditious, nimble, quick, spirited, sprightly, spry
II
(vigilant) adjective
active, alive, attentive, guarded, observant, on guard, prepared, wary, watchful
III
verb
advise, alarm, arouse, caution, give notice, notify, put on one's guard, sound the alarm, warn
IV
index
acute, admonish (advise), advise, apprise, careful, caution (warning), caveat, circumspect, cognizant, conscious (awake), forewarn, guarded, meticulous, monition (warning), notify, perspicacious, preventive, prompt, provident (showing foresight), ready (willing), receptive, responsive, sedulous, sensitive (discerning), vigilant, warning
Burton's Legal Thesaurus.
William C. Burton.
2006