Definition of cautious. : careful about avoiding danger or risk cautious investors cautious optimism.
37 CFR 5.2 Secrecy order. ( 1 a) When notified by the chief officer of a defense agency that publication or disclosure of the invention by the granting of a patent would be detrimental to the national security, an order that the invention be kept secret will be issued by the Commissioner for Patents.
A secret society is a club or an organization whose activities, events, and inner functioning are concealed from non-members. The society may or may not attempt to conceal its existence.