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.
done, made, or conducted without the knowledge of others: secret negotiations. 2. kept from the knowledge of any but the initiated or privileged: a secret password. 3. faithful or cautious in keeping confidential matters confidential; close-mouthed; reticent.