Doubtable means something that is questionable or uncertain. Some of the other synonyms for this word include dubious, questionable, unsure, uncertain, suspicious, skeptical, and untrustworthy. All of these words can be used to describe situations or individuals that are not completely reliable or trustworthy. For example, if someone tells a story that seems too far-fetched to be true, it might be described as doubtable or dubious. It's important to have a good understanding of these synonyms so that you can communicate clearly and effectively in various situations, whether it's in writing or in conversation.