The word "secretness" refers to the quality of being secretive or discreet. If you're looking to express this concept in a variety of ways, there are a number of synonyms you can use. Some examples of words that might convey a sense of "more secretness" include confidentiality, clandestinity, surreptitiousness, stealth, privacy, and discretion. Each of these terms conveys a slightly different nuance, but they all share the underlying idea of keeping something hidden or under wraps. Whether you're trying to describe a covert operation, a confidential conversation, or a confidential document, one of these synonyms might help you convey the level of secretness you're trying to express.