(a.) Inclined to keep silent; reserved; uncommunicative\.

Olympian aloof backward bashful blank chilled chilly close close-lipped close-tongued closemouthed cold constrained cool detached discreet distant expressionless forbidding frigid frosty guarded icy impassive impersonal inaccessible introverted modest offish quiet remote removed repressed reserved restrained retiring shrinking shy silent standoff standoffish subdued suppressed taciturn tight-lipped timid unaffable unapproachable uncommunicative uncongenial undemonstrative unexpansive ungenial unresponsive withdrawn