Frowardly is a word that describes someone who is difficult to deal with or stubbornly contrary. There are several synonyms that can be used to describe such behavior, including obstinately, perversely, waywardly, contumaciously, and contrary. These words share a similar meaning of being unyielding or difficult to persuade. Additionally, one could describe such behavior as being recalcitrant, intractable, or rebellious. All of these synonyms offer alternative ways to express the concept of being frowardly, and can help to add variety and depth to one's writing or speech.