Synonyms for Sure as can be:

• adv.

  •absolutely (adverb)
  • truly,
  • come hell or high water,
  • precisely,
  • no strings attached,
  • doubtless,
  • surely,
  • positively,
  • actually,
  • sure thing,
  • on the button,
  • unquestionably,
  • really,
  • categorically,
  • sure as hell,
  • no ifs ands or buts,
  • on the money,
  • decisively,
  • exactly,
  • for sure,
  • right on,
  • unconditionally,
  • straight out,
  • decidedly,
  • easily,
  • the very thing,
  • sure enough,
  • unambiguously,
  • on the nose,
  • conclusively,
  • definitely.

• adv

  •absolutely (adverb)
  • very thing.

• Other synonyms:

  •adv
  • absolutely.

Antonyms for Sure as can be:

• adv.

  • absolutely
    indefinite, not sure, uncertain, doubtful, partially, incomplete, not certain, questionably, dubiously, doubtfully, questionable.