The Latin phrase "in dubio" is often translated as "in doubt" or "doubtful." There are numerous synonyms for this phrase depending on the context it is used in. "Uncertain," "indecisive," "undecided," and "hesitant" are all synonyms that can describe a state of doubt or uncertainty. Other similar words to "in dubio" include "equivocal," "ambiguous," and "vague," which imply a lack of clarity or definitiveness. "Skeptical," "suspect," and "questionable" can also express a sense of doubt or uncertainty about a situation or statement. Regardless of the specific word, all these synonyms convey the idea of not being able to definitively determine the truth or certainty of something.