He is a secretive person.

他做事总是偷偷摸摸的。

youdao

If you sleep on your stomach, you are a rather secretive person. You worry a lot and you're always easily upset.

如果你俯卧睡觉，说明你比较含蓄。你常忧心忡忡，且容易烦恼。

youdao

"I wouldn't call myself a secretive person, " she said. "But I do want the freedom to vary my level of self-exposure according to circumstance.

她说：“我觉得我并不是喜欢搞神秘，但我的确希望能够根据情况自由调整自我暴露的程度。”

youdao