The signs of passive aggressive behavior include procrastinating, using the silent treatment, brooding and feigning lack of knowledge, according to Psychology Today. These signs sometimes point to an individual who tries to conceal anger and hostility by deliberately displaying behaviors that are the opposite of what he says.
The passive aggressive person may agree to meet a deadline or complete a project and then miss the deadline. He may make intentional mistakes to rebel or act out resentment against another person's demands, according to Mayo Clinic. Such individuals may use passive aggressive behaviors, such as sulking or ignoring, to stymie or punish others, states New Directions Behavioral Health.