The antonyms for the word "un-ambiguous" are numerous, and they all indicate various degrees of obscurity, indistinctness or uncertainty. Some common antonyms for "un-ambiguous" include ambiguous, uncertain, vague, unclear, imprecise, indefinite, indeterminate, dubious, doubtful, mistrustful, suspicious and many others. Unlike "un-ambiguous", these words suggest a lack of clarity, precision or accuracy, making it hard to understand or define something. Ambiguous or uncertain may imply multiple or contradictory meanings, while vague or unclear may suggest a lack of definition or detail. Therefore, when expressing your thoughts or communicating your message, it's important to pick the right words that convey the desired level of clarity and exactness.