"Poutier" is a word often used to describe someone who is sulky or petulant. However, there are a variety of synonyms that could be used to describe someone who is exhibiting such behavior. Some of these synonyms include sullen, glum, moody, brooding, morose, and cross. Other similar words that could be used in place of "poutier" might include bratty, peevish, or whiny. Each of these words conveys a slightly different nuance in terms of the kind of negative attitude being displayed, but all are useful for describing someone who is behaving in a sulky or difficult manner.