The word "un-characteristic" denotes something that is not typical or normal. Therefore, its antonyms can be used to describe traits or behaviors that are familiar, usual, or common. Some of the antonyms of the word "un-characteristic" are typical, customary, habitual, characteristic, normal, usual, and standard. These words suggest the idea of conformity, consistency, and predictability. For instance, you can say that it is typical of Jane to arrive early for work, whereas it would be un-characteristic of her to be late. Similarly, it is normal for children to be playful, and it would be un-characteristic if they were serious all the time.