The antonyms for the phrase "betted bottom dollar on" can be numerous depending on the context of its usage. Some of these antonyms are doubted, hesitated, second-guessed, doubted, and disbelieved. When you doubt something, it means that you are uncertain or skeptical about its occurrence, whereas hesitating means you are not confident enough to make a decision. Second-guessing, on the other hand, is a sign of a lack of confidence or disbelief in one's decisions. Disbelief suggests a complete rejection. Therefore, by considering these antonyms, you can use different phrases to convey your intended meaning with precision.