An example of vindictive in a sentence is, "Tom was very vindictive toward Jerry after he took his snack." "Vindictive" is an adjective used as a synonym for vengeful or unforgiving. Another example is, "Kim was vindictive toward her friends for leaving her behind." Vindictive also replaces "angry."
"Vindictive" typically describes a person's attitude or the perception someone else has about a person's attitude. Someone may see, "Sharon was obviously vindictive when she knocked Toni's bag out of her hand," even though Sharon may have been playing around. An advisory application is, "Don't act vindictive, because it just leads to trouble."