One possible synonym for the word "more surreptitiousness" could be "increased stealthiness," which denotes an even greater level of secrecy and covert behavior. Another option might be "heightened subterfuge," which highlights the use of cunning and deceit to achieve one's goals. Additionally, "augmented clandestinity" could be used to describe an amplified state of being hidden or concealed from others. No matter which synonym is chosen, each carries a similar connotation of increased secrecy and furtiveness, suggesting a need for caution and discretion in one's actions.