The antonyms for the phrase "was the opinion" include words like disagreement, doubt, uncertainty, disbelief, and objection. When someone disagrees with an opinion, they are expressing a contradictory view on the matter. Alternatively, when someone doubts an opinion, they are expressing a lack of conviction or confidence in it. Uncertainty is a state of not being sure or having mixed feelings about an opinion. Disbelief implies a complete lack of trust or faith in an opinion or statement. Lastly, an objection suggests that the person has opposing answers or views to the opinion. Therefore, these antonyms can help us to understand the opposite meanings of "was the opinion.