Stiffnecked is a term used to describe someone who is stubborn or inflexible. Some possible antonyms for stiffnecked might include open-minded, flexible, adaptable, willing to compromise, or easy-going. These terms suggest a person who is not set in their ways and is willing to consider other perspectives or make adjustments to their behavior as needed. Other antonyms for stiffnecked might include gracious, humble, or meek, which suggest a person who is willing to listen to others and show respect and kindness even in difficult situations. Finding antonyms for stiffnecked can be useful in communication, as it helps to avoid using negative language that might cause conflict or hurt feelings.