There are many antonyms for the term "wast sure," which means uncertain or doubtful. Some of these antonyms include "confident," "assured," "secure," "positive," "definite," "certain," and "decisive." These words signify a high level of conviction, trust, and belief, which are opposite to the feeling of doubt and uncertainty. When we are sure of something, it means we have no doubt about it, and we know it will happen. Therefore, using antonyms such as these can help provide clarity, coherence, and assurance in our communication, thoughts, and actions.