" doubtable "

1: giving good reason for being doubted, questioned, or challenged;

  * e.g., " ... her argument rested entirely upon some highly doubtable logic "

•  Synonyms : 

•  debatable,

•  disputable,

•  dodgy,

•  doubtful,

•  dubious,

•  dubitable,

•  equivocal,

•  fishy,

•  problematic,

•  queer,

•  questionable,

•  shady,

•  shaky,

•  suspect,

•  suspicious

•  Antonyms : 

•  certain,

•  hands-down,

•  incontestable,

•  indisputable,

•  indubitable,

•  questionless,

•  sure,

•  undeniable,

•  undoubted,

•  unproblematic,

•  unquestionable

2: open to question or dispute;

  * e.g., " ... that his wartime exploit happened at all is very doubtable "

•  Synonyms : 

•  arguable,

•  controvertible,

•  debatable,

•  disputable,

•  doubtful,

•  issuable,

•  moot,

•  negotiable,

•  questionable

•  Antonyms : 

•  accomplished,

•  certain,

•  hands-down,

•  inarguable,

•  incontestable,

•  incontrovertible,

•  indisputable,

•  indubitable,

•  irrefragable,

•  positive,

•  questionless,

•  settled,

•  sure,

•  unanswerable,

•  unarguable,

•  unchallengeable,

•  undebatable,

•  undeniable,

•  unquestionable

1: to have no trust or confidence in;

  * e.g., " ... I doubt that you can do all that you say "

•  Synonyms : 

•  distrust,

•  misdoubt,

•  mistrust,

•  question,

•  suspect

•  Antonyms : 

•  trust