%incommunicative%

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. [ 1913 Webster ]

The Chinese . . . an incommunicative nation. C. Buchanan.

-- In`com*mu"ni*ca*tive*ly, adv. -- In`com*mu"ni*ca*tive*ness, n. Lamb. [ 1913 Webster ]

His usual incommunicativeness. G. Eliot. [ 1913 Webster ]