percipient

percipient
    adj 1: characterized by ease and quickness in perceiving; "clear
           mind"; "a percipient author" [syn: {clear}, {percipient}]
    n 1: a person who becomes aware (of things or events) through
         the senses [syn: {perceiver}, {percipient}, {observer},
         {beholder}]
    

Percipient \Per*cip"i*ent\, a. [L. percipiens, -entis, p. pr. of
   percipere. See {Perceive}.]
   Having the faculty of perception; perceiving; as, a
   percipient being. --Bentley. -- n. One who, or that which, is
   percipient. --Glanvill.
   [1913 Webster]
    

42 Moby Thesaurus words for "percipient":
      acute, all-knowing, apperceptive, appercipient, apprehending,
      apprehensive, argute, astute, aware, cogent, cognizant,
      comprehending, conscious, discerning, farseeing, farsighted,
      foreseeing, foresighted, forethoughted, forethoughtful, incisive,
      insightful, intelligent, knowing, knowledgeable, longheaded,
      longsighted, mindful, omniscient, penetrating, perceptive,
      perspicacious, perspicuous, piercing, prehensile, provident,
      sagacious, sensible, shrewd, trenchant, understanding, wise