Being dubious refers to the state of uncertainty or doubt surrounding a particular situation or activity. Antonyms of being dubious would include terms such as confident, certain, convinced, assured, convinced, and positive. Being confident suggests a high level of assurance and trust in oneself, whereas being certain implies the absence of any doubts or ambiguity. One who is convinced has been influenced to believe something to be true, making them sure of their position. To be assured is to have confidence in something or someone, while being positive involves being optimistic and hopeful. In contrast to being dubious, each of these antonyms convey a sense of trust, faith or certainty.