Synonyms and related words :
aloofness, backwardness, bashfulness, blankness, chilliness, coldness, constraint, coolness, detachment, discreetness, discretion, distance, expressionlessness, frigidity, frostiness, guardedness, iciness, impassiveness, impassivity, impersonality, inaccessibility, introversion, modesty, remoteness, repression, reserve, reservedness, restraint, reticency, retirement, standoffishness, subduedness, suppression, unaffability, unapproachability, uncongeniality, undemonstrativeness, unexpansiveness, withdrawal, withdrawnness