Sneakiness is often associated with deceitfulness and dishonesty. There are several synonyms that can be used to describe this unpleasant trait. Some words that could be used as synonyms for sneakiness include craftiness, underhandedness, slyness, trickery, and duplicity. These words all suggest a sense of deviousness and duplicity. Other synonyms for sneakiness that are more negative in connotation include cunning, deceit, and treachery. Using these words can help to convey a deeper sense of mistrust, as they imply more serious forms of deception and betrayal. When characterizing someone as sneaky, it is important to choose words that accurately capture the full scope of their behavior.