Pertinaciousness is the quality of holding firmly to a belief or purpose, often to the point of being obstinate. The antonyms for this word include flexibility, open-mindedness, and adaptability. These qualities involve being willing to listen to different perspectives, consider new ideas, and change one's own stance when necessary. Another antonym for pertinaciousness is indecisiveness, which refers to a lack of determination or commitment to a specific course of action. Instead of persisting in one direction, an indecisive person may waver or hesitate, lacking clarity and resolve. Overall, antonyms for pertinaciousness emphasize the importance of staying open to new information and approaches, while also being willing to change direction if needed.