The Collaborative International Dictionary of English v.0.48:

Communicative \Com*mu"ni*ca*tive\, a. [Cf. F. Communicatif, LL.
   communicativus.]
   Inclined to communicate; ready to impart to others.
   [1913 Webster]

         Determine, for the future, to be less communicative.
                                                  --Swift.
   [1913 Webster]

WordNet (r) 3.0 (2006):

communicative
    adj 1: of or relating to communication; "communicative arts"
    2: able or tending to communicate; "was a communicative person
       and quickly told all she knew"- W.M.Thackeray [syn:
       communicative, communicatory] [ant: incommunicative,
       uncommunicative]

Moby Thesaurus II by Grady Ward, 1.0:

90 Moby Thesaurus words for "communicative":
   accessible, advisory, affable, all jaw, amiable, approachable,
   candid, chatty, chitchatty, civil, clubbable, clubbish, clubby,
   colloquial, communicable, companionable, companionate, compatible,
   confabulatory, congenial, conversable, conversational, courteous,
   cozy, demonstrative, educational, educative, effusive,
   enlightening, expansive, extroverted, fit for society, flip,
   fluent, fond of society, frank, free, free-speaking, free-spoken,
   free-tongued, friendly, gabby, garrulous, gassy, genial, glib,
   gossipy, gregarious, gushing, gushy, hospitable, informational,
   informative, informing, instructive, interlocutory, long-winded,
   loquacious, monitory, multiloquent, multiloquious, newsy, open,
   outgoing, outspoken, overtalkative, prolix, self-revealing,
   self-revelatory, smooth, sociable, social, social-minded,
   talkative, talky, unconstrained, unhampered, unrepressed,
   unreserved, unrestrained, unrestricted, unreticent, unsecretive,
   unshrinking, unsilent, unsuppressed, urbane, verbose, voluble,
   windy