Wilily is an adverb that means to do something in a sly or crafty manner, often with the intention of deceiving or misleading someone else. Synonyms for wilily include cunningly, deviously, shrewdly, sneakily, slyly, artfully, astutely, cleverly, calculatingly, and guilefully. These words all describe a person who is capable of thinking and acting with strategic intent, often in a way that is not immediately apparent to others. Whether it be in the context of business negotiations, political maneuvering, or interpersonal relationships, those who act wilily are often praised for their ability to get what they want without anyone realizing what is happening.