What is the opposite of "petulant"?

The term "petulant" refers to a person who is irritable or easily annoyed, often displaying childish behavior. When considering an opposite for "petulant," the word "calm" fits perfectly. A calm individual maintains composure and remains unruffled by minor irritations, contrasting the irritable and fickle nature of someone who is petulant.

The other choices do not provide the clear opposite context that "calm" does. For instance, "bratty" shares similar connotations with "petulant," referring to someone who is spoiled or difficult. "Passionate" describes a strong emotional state, which doesn't directly contrast with irritability. "Loyal" pertains to faithfulness and devotion, also not relating to the temperament implied by "petulant." Therefore, "calm" effectively encapsulates the opposite of being irritable or moody.