trickery

"The doctor applied a sterile dressing to the child's scraped knee. "

"The child's disruptive behavior in class was a concern for the teacher. "

"His entire career was built on imposture; he faked his qualifications and pretended to be an expert in a field he knew nothing about. "

"My mother's instance that I finish my homework before dinner was quite strong. "

"The magician made a rabbit disappear from his hat, amazing all the children. "

"We joined the audience just as the lights went down."

"Using artificial additives, scientists can create the illusion of fruit flavours in food."

"The pitcher underhanded the baseball to the catcher. "

"The politician's sudden show of concern for the poor was seen by many as mere artifice to win votes. "

"The student's deception about completing the assignment led to a disappointing grade. "

"To get the promotion, he resorted to underhanded stratagems, like spreading rumors about his coworkers. "

"the performance of an undertaking or a duty"