discreet
/dɪˈskri:t; dɪ`skrit/ adj
careful or showing good judgement in what one says or does; not too obvious 言谈举止谨慎的; 言行审慎的; 不显眼的
We must be extremely discreet; my husband suspects something. 我们必须极为小心才是, 我丈夫已起疑了.
I should make a few discreet enquires about the firm before you sign anything. 我应该先审慎打探一下这家公司的底细, 然後您再签字.
(fig 比喻) a discreet perfume, ie one that is not too obvious 香气清淡的香水.