The term "sulker" refers to someone who sulks, pouts, or acts in an uncommunicative and resentful manner. While the word "sulker" is commonly used, there are many synonyms that can also be used to describe this behavior. Some common synonyms include "mope," "brood," "sulk," "grump," "grouch," and "gloomy." Other variations may include "moody," "petulant," "querulous," and "peevish." These terms all describe negative attitudes or unpleasant moodiness, which can often be frustrating for those around the individual exhibiting such behavior. However, by identifying and using a variety of synonyms, we can better understand and engage with these emotional states and work to improve communication and relationships.