Carefully observant or attentive; on the lookout for possible danger:
— A policy of open-eyed awareness.

synonyms: argus-eyed, vigilant, wakeful.

Roget 457: attentive, mindful, observant, regardful; alive to, awake to; observing etc. v.; alert, open-eyed; intent on, taken up with, occupied with, engaged in; engrossed in, wrapped in, absorbed, rapt, transfixed, riveted, mesmerized, hypnotized; glued to (the TV, the window, a book); breathless; preoccupied etc. (inattentive) 458; watchful etc. (careful) 459; breathless, undistracted, upon the stretch; on the watch etc. (expectant) 507.    steadfast.    [compelling attention] interesting, engrossing, mesmerizing, riveting.    ... show more

Roget 507: expectant; expecting etc. v.; in expectation etc. n.; on the watch etc. (vigilant) 459; open-eyed, open-mouthed, in wide-eyed anticipation; agape, gaping, all agog; on tenterhooks, on tiptoe, on the tiptoe of expectation; aux aguets^†; ready; curious etc. 455; looking forward to.    expected etc. v.; long expected, foreseen; in prospect etc. n.; prospective; in one's eye, in one's view, in the horizon, on the horizon, just over the horizon, just around the corner, around the corner; impending etc. (destiny) 152.    ... show more