" doubtless "

1: having or showing a mind free from doubt;

  * e.g., " ... another one of his doubtless predictions that will never come true "

•  Synonyms : 

•  assured,

•  certain,

•  clear,

•  cocksure,

•  confident,

•  implicit,

•  positive,

•  sanguine,

•  sure

•  Antonyms : 

•  doubtful,

•  dubious,

•  uncertain,

•  unsure

1: without any question;

  * e.g., " ... she is doubtless the one and only girl for me "

•  Synonyms : 

•  all right,

•  alright,

•  assuredly,

•  certainly,

•  clearly,

•  definitely,

•  easily,

•  forsooth,

•  hands down,

•  inarguably,

•  incontestably,

•  incontrovertibly,

•  indeed,

•  indisputably,

•  plainly,

•  really,

•  so,

•  sure,

•  surely,

•  truly,

•  unarguably,

•  undeniably,

•  undoubtedly,

•  unquestionably

•  Antonyms : 

•  improbably

2: by reasonable assumption;

  * e.g., " ... doubtless you have heard this story before, but I'll tell it anyway "

•  Synonyms : 

•  assumably,

•  likely,

•  presumably,

•  probably

•  Antonyms : 

• (N/A)