Incommunicative

In`com·mu'ni·ca·tive adjective 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 nat...
Found on http://www.encyclo.co.uk/webster/I/34

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.
Found on http://thinkexist.com/dictionary/meaning/incommunicative/
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