Definition: The word "doubtful" is an adjective that describes a feeling of uncertainty or lack of confidence about something. When you are doubtful, you are unsure if something is true, likely, or good.
"Doubtful" is a useful word to express uncertainty or skepticism about something. Whether you are unsure about a weather forecast or questioning someone's credibility, "doubtful" helps convey that feeling of hesitation and lack of confidence.