Querulous comes from the Latin word querulus, meaning “full of complaints” or “whiny.” In English, it has been used since the early 15th century to describe someone or something that is full of complaints or complaining. Querulousness can be found in many different contexts, from personal relationships and customer service to politics and social media. Today, querulous remains a commonly used word in English, and is often associated with negativity, irritability, and dissatisfaction.