There are several antonyms for the phrase "contrary fact." Some synonyms, or words with the opposite meaning, include supporting evidence, corroborating testimony, and confirmation. Other antonyms include agreement, harmony, consistency, and cohesion. These words all suggest a sense of unity and conformity rather than opposition. While contrary facts may introduce doubt or uncertainty into a situation, these antonyms suggest a level of agreement and consensus that allows for confident decision-making. It is important to consider both contrary facts and their antonyms when evaluating evidence or making decisions, in order to ensure a balanced and accurate perspective.