'concealed nature' is correct and usable in written English.
You can use it to describe something that is hidden and difficult to understand, such as a person's true motives or feelings. For example, "She had a concealed nature that made it hard to know what she was really thinking."
But the added force of law was still needed, Mr. Sun said after the conference, in order to "keep up with the seriousness, speed and concealed nature of secrets leaked over new technologies".
Owing to the concealed nature of many frauds and the fact that few are reported even when discovered, their cost is impossible to estimate precisely, but in the United States it is thought to be at least 10 times the combined cost of thefts, burglaries, and robberies.
Conversely, the concealed nature of V3 in the HIV-2 envelope complex implies that this region may not be immunodominant in HIV-2 infection.
Unsurprisingly, sperm competition and cryptic female choice are often difficult to study, not least due to the concealed nature of the processes involved (Simmons, 2001).
The concealed nature of the industry [ 37] makes commissioning services specific to this patient group challenging, and women may not wish to access a specific service, which would mean having to disclose the nature of their work to the health care practitioner.
As well, the more "private" or "concealed" nature of the PDA (i.e. it is difficult for others sitting adjacent to the participant to see the PDA screen) may support participants in feeling more comfortable spending time to complete the entire questionnaire.
Because of the concealing nature of the nest cavity, the behaviour of hole-nesting birds is more difficult to study than that of species building exposed nests.
In the quest of revealing nature's secrets during the past centuries, science has explored many concealed natural resources, thus opening a big market to the chemical industries.
Mr. Sebastian concealed the nature of the transactions from the company's auditors and reported them as revenue, according to the attorney's office.
The export of such material is regulated by the federal government for national security reasons, but prosecutors alleged Mr. Fishenko — and several employees of his Houston company, Arc Electronics Inc. — falsified federal export documents and concealed the nature of their work, telling American suppliers that they were not exporters but traffic-light manufacturers.
These sites are in stark contrast with their violent histories which, over time, are concealed by nature.
