1. uncommunicative
1. incommunicative, blank, close, closelipped, closemouthed, secretive, tightlipped, deadpan, expressionless, impassive, poker-faced, unexpressive, guarded, noncommittal, unrevealing, incommunicado, mum, silent, unpronounceable, unutterable, inexpressive, inarticulate, unarticulate, taciturn