The Collaborative International Dictionary
Incommunicatively
Incommunicative \In`com*mu"ni*ca*tive\,
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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.
--Lam His usual incommunicativeness.
--G. Eliot.
Wiktionary
incommunicatively
adv. In an incommunicative way.