The term "double talk" refers to a kind of speech that is deliberately vague or confusing to deceive or mislead others. When someone engages in "most double talk," they are using this tactic to a significant degree. Antonyms for "most double talk" would therefore include adjectives such as clear, direct, honest, straightforward, and unambiguous. These kinds of words all describe a communication style that emphasizes clarity and meaning, rather than evasion or obfuscation. Someone who speaks in a way that is antithetical to double talk might be described as forthcoming, sincere, or transparent, among other possibilities.