Snakiness means having the qualities of a snake, such as being sly or deceitful. Some synonyms for snakiness include sneakiness, cunning, craftiness, guile, duplicity, deception, and treachery. Sneakiness refers to being sly or furtive in one's actions, while cunning relates to having a keen intellect and being shrewd in one's dealings. Craftiness implies the use of skill and cleverness to deceive or manipulate others. Guile suggests a subtle and artful deception. Duplicity refers to the act of having two-facedness or deceitfulness. Deception implies an intentional act of misleading someone. Treachery relates to betrayal or disloyalty. All these words refer to a lack of sincerity or honesty in one's dealings with others.