discreet

adj. /dɪˈskriːt/ C1

谨慎的；慎重的

Careful not to attract attention or cause embarrassment.

仙境例句

The Dormouse was discreet and never told anyone what he heard while he pretended to sleep.

睡鼠嘴很严，装睡时听到的话，他从不告诉任何人。