Palindromes are words or phrases that read the same forwards and backward. Because of the nature of the words "silent" and "secretive", it's impossible to find a palindrome that has the same meaning.
However, you can play with the concept of silence and secrecy and find palindromes related to those ideas:
* "Racecar" is a palindrome that might represent the speed and quietness of a car.
* "Madam, I'm Adam" is a palindrome that could be seen as a playful way to introduce a secretive, hidden identity.
Ultimately, creating a palindrome for "silent" or "secretive" would require some poetic license or creative interpretation.