" dubiousness "

1: as in shakiness, doubtfulness;

•  Synonyms : 

•  doubtfulness,

•  questionableness,

•  shakiness,

•  uncertainness,

•  dodginess,

•  unreliability

•  Antonyms : 

•  dependability,

•  dependableness,

•  reliability,

•  reliableness,

•  responsibility,

•  solidity,

•  solidness,

•  sureness,

•  trustability,

•  trustworthiness,

•  inerrancy,

•  infallibility,

•  credibility,

•  creditability,

•  creditableness

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

  * e.g., " ... any letter bearing the signature of Geronimo would be of dubious authenticity, to say the least "

•  Synonyms : 

•  debatable,

•  disputable,

•  dodgy,

•  doubtable,

•  doubtful,

•  dubitable,

•  equivocal,

•  fishy,

•  problematic,

•  queer,

•  questionable,

•  shady,

•  shaky,

•  suspect,

•  suspicious

•  Antonyms : 

•  certain,

•  hands-down,

•  incontestable,

•  indisputable,

•  indubitable,

•  questionless,

•  sure,

•  undeniable,

•  undoubted,

•  unproblematic,

•  unquestionable

2: slow to begin or proceed with a course of action because of doubts or uncertainty;

  * e.g., " ... I'm dubious about our plan to go hang gliding without having had any training "

•  Synonyms : 

•  cagey,

•  disinclined,

•  hesitant,

•  indisposed,

•  loath,

•  reluctant,

•  reticent

•  Antonyms : 

•  disposed,

•  inclined

3: not likely to be true or to occur;

  * e.g., " ... made the dubious claim of being of royal blood "

•  Synonyms : 

•  doubtful,

•  far-fetched,

•  flimsy,

•  improbable,

•  questionable,

•  unapt,

•  unlikely

•  Antonyms : 

•  likely,

•  probable