The antonyms for "un-mistakable" include debatable, ambiguous, uncertain, doubtful, unclear, and equivocal. These terms refer to situations in which there is more than one way to interpret or understand something, making it difficult to reach a definite conclusion. For example, if someone says something ambiguous, it can be hard to know exactly what they mean since their words could have more than one interpretation. Similarly, if something is unclear, it may take further explanation or clarification to gain a clear understanding. The use of antonyms to describe a word's opposite is an important tool in understanding the multiple meanings and nuances of language.