ETYM Cf. Latin cautus, from caver. Related to Caution.
1. Showing careful forethought.
2. Unwilling to take risks.
3. Careful in attitude and careful in actions; prudent.
4. Avoiding excess; SYN. conservative.
Uncommunicative
1. Cool and formal in manner; SYN. restrained, reticent, unemotional.
2. Marked by self-restraint and reticence.
3. Set aside for the use of a particular person or party.
ETYM Cf. French rétentif.
Tending to retain, having the power, property, or capacity of retaining ; especially; retaining knowledge easily.
Reservedly, with restraint, while controlling one's emotions