ret·i·cent
adjective/ˈretɪsnt/
/ˈretɪsnt/
(formal)- unwilling to tell people about things
寡言少语的；不愿与人交谈的；有保留的 - She was shy and reticent.
她羞怯而寡言少语。 - reticent about something He was extremely reticent about his personal life.
他对自己的私人生活讳莫如深。
Word Originmid 19th cent.: from Latin reticent- ‘remaining silent’, from the verb reticere, from re- (expressing intensive force) + tacere ‘be silent’. - She was shy and reticent.