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I am sensing some reticence in your couched answer.
"Reticent" is the adjectival form of the noun "reticence".
The cast of Reticence - 2008 includes: Marc Jablon as Marc
The root word of reticence is "reticent," which comes from the Latin word "reticentia," meaning silent or reserved.
A sentence with the word 'reticence': His reticence made him lonely and a less friendlier person.