The antonyms for the word "unambiguous" are numerous, and they all vary in their degree of ambiguity. Some of the most common antonyms include ambiguous, vague, unclear, uncertain, and equivocal. These words describe situations where there is little or no clarity, meaning that the message or intention conveyed is either unclear or open to interpretation. Other antonyms may include obscure, cryptic, enigmatic, and inscrutable, all of which suggest a lack of clarity, transparency, or straightforwardness. Ultimately, the choice of antonym will depend on the context and purpose of the communication, as well as the degree of precision and clarity needed to effectively convey the message.