1. (a.) Watchful; vigilant or on one's guard against danger or difficulty.

2. (a.) Apprised; informed; cognizant; conscious; as, he was aware of the enemy's designs.

acquainted advertent agog alert alive alive to all ears all eyes all-knowing apperceptive appercipient appreciative of apprehending apprehensive apprised apprised of assiduous attentive au courant au fait awake awake to aware of awash behind the curtain behind the scenes brimful brimming careful chock-full cognizant cognizant of comprehending concentrated conscious conscious of conversant crammed crowded diligent earnest enlightened finical finicking finicky heedful hep hep to hip impressible impressionable impressive in the know in the secret informed informed of insightful intelligent intense intent intentive jammed knowing knowledgeable let into loaded meticulous mindful mindful of nice niggling no stranger to observant observing omniscient on the ball on the job on to open-eared open-eyed openmouthed packed perceptive percipient perspicacious posted prehensile privy to receptive regardful sagacious seized of sensible sensible of sensible to sensile sensitive sensitive to sentient shrewd streetwise stuffed susceptible susceptive undeceived understanding ware watchful wise wise to witting