reticent

silent, taciturn, reticent, reserved, secretive mean showing restraint in speaking. silent implies a habit of saying no more than is needed <the strong, silent type>. taciturn implies a temperamental disinclination to speech and usually connotes unsociability <taciturn villagers>. reticent implies a reluctance to speak out or at length, especially about one's own affairs <was reticent about his plans>. reserved implies reticence and suggests the restraining influence of caution or formality in checking easy informal conversational exchange <greetings were brief, formal, and reserved>. secretive, too, implies reticence but usually carries a suggestion of deviousness and lack of frankness or of an often ostentatious will to conceal <the secretive research and development division>.