Worthy of doubt; uncertain.

Characterised or marked by doubt; doubtful

Archaic form of doubtful.

(obsolete) doubtful

(obsolete) doubt; uncertainty

comparative form of doubtful: more doubtful

(archaic) third-person singular simple present indicative form of doubt

(archaic) second-person singular simple present form of doubt

(baseball slang) a certain home run; a home run about which there is no doubt.

(rare) One who causes doubt; a person who is doubted.