Antonyms for the word "stick-to-itiveness" include inconsistency, irresolution, vacillation, fickleness, indecisiveness, and inconstancy. These words represent a lack of determination and perseverance, which is the opposite of the quality of stick-to-itiveness. When someone lacks stick-to-itiveness, they give up easily, change their mind frequently, and struggle to commit to a particular course of action. On the other hand, people with a strong sense of stick-to-itiveness are resilient, committed, and focused on achieving their goals. Antonyms for this word suggest qualities that can hinder progress and achievement, highlighting the importance of perseverance and steadfastness in achieving success.