By a devious way is a phrase that describes a person's cunning and sly behavior. It implies a sense of trickery and deceit in their actions. There are various synonyms for this phrase, including underhandedly, shrewdly, cunningly, treacherously, sneakily, wily, or slyly. These words reflect the actions of someone who is trying to achieve their goals through clever manipulation and hidden intentions. Using such phrases can help to strengthen the emotions and add flair to a piece of writing, especially when describing a person's character or actions in a story or essay.