Similar word to observative:

alert, alive to, apprehensive, au courant, be up on, cagey, careful, cautious, chary, cognizant, conscientious, conscious, conversant, heedful, in the know, know all the answers, know ins and outs, knowing, knowledgeable, observant, observative, observing, on one's toes, on the ball, on the job, on to, plugged in, regardful, respectful, sensible, solicitous, thoughtful, tuned in, vigilant, wary, watchful, with eyes peeled


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