Synonyms

• taciturn
• poker-faced
• silent
• unarticulate
• blank
• inexpressive
• unexpressive
• close
• closelipped
• inarticulate
• incommunicado
• mum
• expressionless
• uncommunicative
• closemouthed
• impassive
• deadpan
• unpronounceable
• vacuous
• secretive
• tightlipped