The word "furtiveness" refers to the quality of being secretive, sly, or sneaky. If you're looking for synonyms for "more furtiveness," you might consider words like surreptitiousness, stealthiness, or subterfuge. Other options could include deceptiveness, evasiveness, cunning, or guile. Each of these words implies a sense of shadiness or covert activity, and can be used to describe situations where someone is trying to hide something or act in a sneaky way. Whether you're describing a character in a novel or a real-life situation, these synonyms for "more furtiveness" can help you capture the sense of secrecy and intrigue you're trying to convey.