Shilly-shally is a word that refers to indecisiveness or hesitation, often with regards to taking action or making a decision. Some antonyms for shilly-shally include assertiveness, decisiveness, and resoluteness. This means that someone who is assertive takes decisive and resolute action in the face of difficult or uncertain situations, without wasting time on hesitating or second-guessing themselves. Other antonyms for shilly-shally could include steadfastness, commitment, and determination, all of which connote a sense of purpose and a willingness to stick to one's goals, even in the face of adversity or uncertainty. Overall, antonyms for shilly-shally are words that express confidence, conviction, and a sense of purpose.