Doubtful Synonyms
Words/phrases that have a similar definition to the word "doubtful" include...unreliable, suspect, questionable, distrustful, in doubt, not probable, dubious, untrustworthy, suspicious, unsure, hesitant, disbelieving, cynical, unpromising, shaky, debatable, uncertain, unconvinced, unsavory, insecure, improbable, unlikely, shady, fishy
Other words in thesaurus...