When referring to "most covertness," there are a plethora of synonyms to use. Some of the most commonly used alternatives include secrecy, stealth, hiddenness, subterfuge, sneaking, and surreptitiousness. These terms all describe a level of secrecy or concealment, whether through intention or action. Other synonyms may include slyness, conniving, underhandedness, or cloak-and-dagger tactics. These terms may be used to describe more sly or devious behavior, such as espionage or sabotage. Depending on the context, any of these synonyms could be used to replace "most covertness" while maintaining the same general meaning.