Mousiness is defined as the quality of being timid, shy or fearful. It can also refer to being small or unassuming in appearance. Antonyms for mousiness are confidence, bravery, boldness, and courage. Other related antonyms include extroversion, assertiveness, and audacity. These qualities describe someone who is outgoing, assertive, and willing to take risks. A person who is confident and bold inspires others and stands out from the crowd. These antonyms are all traits of leadership and can help someone achieve their goals and succeed in life. By cultivating these qualities, one can overcome their mousiness and become more confident and successful.