The phrase "slippery nature" refers to something that is difficult to handle or deal with because it keeps changing or is unpredictable. Full definition
I really don't like the mirror - like, reflective, fingerprint - grabbing back of the phone, either in appearance or in its somewhat slippery nature. (zdnet.com)
Taking as a starting point the contemporary image world, the flattened digital space through which associations between the disparate are often made, the objects that Marten finds, fabricates and constructs utilise this structure of networked images, consumption and communication while engaging with the potentially slippery nature of material properties, the tactility of form and sensory space. (contemporaryartsociety.org)
If there is still resistance to granting that a psychological offense is sufficient cause for modifying the use of language, then recall that lawyers have long been conscious of the slippery nature of the English male pronoun. (religion-online.org)