The Word for Today is ‘sly’. It means having a nature that is cunning and deceitful. The key here is in the nature, otherwise the meaning of the word would fall. Without cunning and deceitful emanating from a nature, sly would just be cunning and deceitful but that can’t exist by itself. Somone is cunning and deceitful. Someone is sly. Sly is an adjective so it describes an inner nature. Someone exists or lives in that nature. He is sly.
I always have a reservation about this word because it implies a bad or wrong centered nature. But is describes a reality. Sometimes there are people we may come across that are sly which is scary. But sly is a word I keep at a distance and use it rarely as the word must fit the character, the story, the sentence, etc.