all there, astute, attentive, au courant, aware, canny, cognizant, commonsensical, conscious, consequent, conversant, cool*, discerning, discreet, discriminating, down-to-earth, far-sighted, having all one's marbles, in right mind, informed, intelligent, judicious, knowing, logical, matter-of-fact, practical, prudent, rational, sagacious, sage, sane, sentient, shrewd, sober, sound, together, well-reasoned, well-thought-out, wise, witting