The definition of passive aggressive is behavior that is exhibited by a person who is dissatisfied, uncooperative or unhappy but who doesn't want to be overtly mean or rude. Instead, the person behaves in a subtly contrary way.
An example of passive aggressive is secretly turning the air conditioning up every time your spouse leaves the house because you have fought about what temperature to keep it on in the past.
designating or of a kind of seemingly nonassertive behavior characterized by disguised aggression and resistance to the demands of others, esp. as expressed by procrastination or stubbornness
Of, relating to, or characterized by habitual passive resistance to requirements for performance in occupational or social situations, as by procrastination, stubbornness, sullenness, or inefficiency.