Other forms: spites; spited; spiting
When your sister told you that you looked terrible in your new tube top, she may have been saying it out of spite, or in a deliberately mean or offensive way.
The noun spite means "a desire to offend." The word spite can also take the form of a verb, when it's used like this: "He only became a vegetarian to spite his cattle rancher father." Either way, spite implies a grudge, a desire to offend or hurt the feelings of someone by actions or words.