Which term describes someone who is given to complaining and is often peevish?

The term that best describes someone who is given to complaining and is often peevish is "querulous." This adjective specifically refers to a person's tendency to express grievances or complaints, often in a whining or petulant manner. A querulous individual may frequently find fault with situations or decisions, resulting in a negative and often irritable demeanor. This word captures the essence of being habitually discontented or dissatisfied, which aligns perfectly with the definition sought in the question.

In contrast, "quixotic" refers to being overly idealistic or romantic, often in a way that is impractical; "raconteur" describes someone who is skilled at telling stories or anecdotes engagingly; and "recalcitrant" denotes someone who is obstinately resistant to authority or control. None of these options convey the specific trait of complaining or being peevish as accurately as "querulous."