Antonyms for the phrase "not in the mood" could include "eager," "excited," "enthusiastic," "motivated," "spirited," "optimistic," "avid," "keen," "inspired," "passionate," "energized" and "animated." Individuals who are "not in the mood" may feel uninterested, unmotivated, and unenthusiastic, but by cultivating an antithesis mindset, one can turn the situation around. These antonyms can be brought about by focusing on the positive while letting go of the negative thoughts affecting one's mood. By feeling enthusiastic and energized, individuals can tackle the day's challenges and be more productive, which, in turn, will improve their mood.