secretive

1. ADJ If you are secretive, you like to have secrets and to keep your knowledge, feelings, or intentions hidden. 藏而不露的; 諱莫如深的

Billionaires are usually fairly secretive about the exact amount that they're worth. 億萬(wàn)富翁們通常對(duì)有關(guān)他們身價(jià)的確切數(shù)字諱莫如深。