Wimpishness is a characteristic trait that describes someone who is weak-willed, cowardly, and lacks confidence. However, there are a number of antonyms to the word "wimpishness" that exude strength, courage, and self-assuredness. Such antonyms include boldness, bravery, assertiveness, courage, fortitude, and mettle. These traits describe individuals who are fearless, resolute and determined, and have the courage to face challenges head-on. A person who embodies these traits is often admired for their self-assuredness and ability to stand up for what they believe in. These antonyms not only describe a different type of person but are also qualities that can be learned and developed over time.