Source : Webster's Revised Unabridged Dictionary (1913)

Incommunicative \In`com*mu"ni*ca*tive\, a.
   Not communicative; not free or apt to impart to others in
   conversation; reserved; silent; as, the messenger was
   incommunicative; hence, not disposed to hold fellowship or
   intercourse with others; exclusive.

         The Chinese . . . an incommunicative nation. --C.
                                                  Buchanan.
   -- {In`com*mu"ni*ca*tive*ly}, adv. --
   {In`com*mu"ni*ca*tive*ness}, n. --Lamb.

         His usual incommunicativeness.           --G. Eliot.

Source : WordNet®

incommunicative
     adj : not inclined to talk or give information or express opinions
           [syn: {uncommunicative}] [ant: {communicative}]