[syn: intimate, knowledgeable, versed]
The Collaborative International Dictionary of English v.0.48:
knowledgeable \knowledgeable\ adj.
   1. thoroughly acquainted with and skilled in something
      through study or experience; as, knowledgeable in
      classical languages. Opposite of unversed,
      unacquainted, and unfamiliar.
   Syn: versed.
        [WordNet 1.5]
   2. fully informed.
      [WordNet 1.5]
   3. highly educated; having information or understanding.
   Syn: enlightened, learned, lettered, literate, well-educated,
        well-read.
        [WordNet 1.5] -- knowledgeability, n. --
        knowledgeably, adv. -- knowledgeableness, n.
        [PJC]
WordNet (r) 3.0 (2006):
knowledgeable
    adj 1: highly educated; having extensive information or
           understanding; "knowing instructors"; "a knowledgeable
           critic"; "a knowledgeable audience" [syn: knowing,
           knowledgeable, learned, lettered, well-educated,
           well-read]
    2: alert and fully informed; "a knowing collector of rare
       books"; "surprisingly knowledgeable about what was going on"
       [syn: knowledgeable, knowing]
    3: thoroughly acquainted through study or experience; "this
       girl, so intimate with nature"-W.H.Hudson; "knowledgeable
       about the technique of painting"- Herbert Read [syn:
       intimate, knowledgeable, versed]
Moby Thesaurus II by Grady Ward, 1.0:
60 Moby Thesaurus words for "knowledgeable":
   all-knowing, apperceptive, appercipient, apprehending,
   apprehensive, au courant, au fait, authoritative, aware, brainy,
   bright, brilliant, clever, cognizant, comprehending, confined,
   conscious, cultured, discerning, enlightened, erudite, expert,
   familiar, feature, featured, gnostic, in the know, insightful,
   intelligent, knowing, knowledgable, learned, limited, mindful,
   omniscient, perceptive, percipient, perspicacious, prehensile,
   quick-witted, ready, restricted, sagacious, sage, sensible, sharp,
   shrewd, smart, sophic, sophisticated, specialist, specialistic,
   specialized, technical, understanding, well-educated,
   well-informed, well-read, wise, worldly