The Collaborative International Dictionary of English v.0.48:
Reserved \Re*served"\ (-z?rvd"), a.
1. Kept for future or special use, or for an exigency; as,
reserved troops; a reserved seat in a theater.
2. Restrained from freedom in words or actions; backward, or
cautious, in communicating one's thoughts and feelings;
not free or frank.
To all obliging, yet reserved to all. --Walsh.
Nothing reserved or sullen was to see. --Dryden.
[1913 Webster] -- Re*serv"ed*ly (r?-z?rv"?d-l?), adv. --