Although the state of reservedness can be described in a negative sense (e.g. aloof, non-committal, misanthropic, offish, cold, standoffish etc), it is nonetheless a timeless christian (and non-christian) virtue over the centuries.
For those of us who are seeking biblical womanhood, this neglected virtue and disposition should be a hidden treasure. The state of reservedness is a natural flow from a feminine fountain called ; the ornament of a meek and quiet spirit (1 Pet. 3:4, KJV), which is ἄφθαρτο (imperishable, incorruptible).
But let it be the hidden man of the heart, in that which is not corruptible, even the ornament of a meek and quiet spirit, which is in the sight of God of great price.[KJV]
but let your adorning be the hidden person of the heart with the imperishable beauty of a gentle and quiet spirit, which in God’s sight is very precious.[ESV]
but let it be the hidden man of the heart, in the incorruptible apparel of a meek and quiet spirit, which is in the sight of God of great price.[ASV]
The feminine reservedness is lovingly considerate; it avoids being a showy bloom but seeks to cover her glory in order to uncover the indescribable beauty of her heavenly Bridegroom, Jesus; it prefers to be retiring and withdrawn, hidden from the public gaze, so that it can enjoy sweet and melodious communion with Him in her inner sanctum unreservedly and perpetually. It is firm but never loud. Its door is cautiously closed to any "strangers" who might loose her heavenly/earthly fidelity.
The disposition of feminine reservedness is soul-soothing. It stays her place calmly and speaks by being silent...as an innocent little flower does to forest-hikers.
O fellow pilgrims, let us seek and preserve this treasure and ever cherish it!