The term dubious has a negative connotation, indicating uncertainty, doubt or suspicion. On the other hand, the antonyms of this phrase are associated with positivity, confidence and ease. Some of the antonyms for the phrase "were dubious" include absolute, certain, confident, convinced, definite, determined, indisputable, assured, clear, and unwavering. When someone is not dubious, they have a clear understanding and belief in themselves or a particular situation. Unlike the phrase "were dubious," the antonyms of this phrase denote certainty and confidence, which could have a great impact on an individual's approach towards a particular issue.