"Worked into lather" is a phrase that denotes being upset or agitated about something. The antonyms for this phrase could be "calm," "serene," "composed," "unperturbed," and "tranquil." These words denote a sense of peace, calmness, and composure in one's thoughts and actions. The antonym for "worked into lather" represents a state of emotional balance, where one is not excessively emotional or agitated. To be calm and tranquil is to be in control of one's emotions and thoughts. These antonyms are useful in situations where one needs to maintain a sense of composure and not react to provocation, as they represent a state of inner strength and poise.