Synonyms for For certain:

• adj.

  •inevitable (adjective)
  • doomed,
  • destined,
  • prescribed,
  • fixed,
  • impending,
  • unavoidable,
  • decreed,
  • imminent,
  • inescapable,
  • fateful,
  • assured,
  • inflexible,
  • necessary,
  • obligatory,
  • settled,
  • determined,
  • foreordained,
  • unalterable,
  • pat,
  • undeniable,
  • irrevocable,
  • compulsory,
  • inexorable,
  • ineluctable,
  • decided,
  • binding.
  •unmistakable (adjective)
  • indisputable,
  • conspicuous,
  • transparent,
  • glaring,
  • unequivocal,
  • apparent,
  • obvious,
  • patent,
  • palpable,
  • clear,
  • evident,
  • manifest,
  • pronounced,
  • plain,
  • explicit,
  • distinct,
  • straightforward,
  • unambiguous.
  •unquestionable (adjective)
  • absolute,
  • veritable,
  • incontrovertible,
  • authentic,
  • indubitable,
  • incontestable,
  • irrefutable,
  • undoubted,
  • established,
  • flat,
  • genuine,
  • conclusive,
  • accurate,
  • undisputable,
  • cold,
  • self-evident,
  • reliable,
  • true,
  • well-grounded,
  • downright,
  • dependable,
  • bona fide,
  • unimpeachable,
  • flawless,
  • superior,
  • real,
  • faultless,
  • perfect.

• adv.

  •exactly (adverb)
  • absolutely,
  • utterly,
  • precisely,
  • bang,
  • quite,
  • positively,
  • right,
  • truly,
  • faithfully,
  • just,
  • on the nose,
  • correctly,
  • altogether,
  • totally,
  • completely,
  • specifically,
  • sharp,
  • strictly,
  • wholly,
  • expressly,
  • definitely,
  • carefully,
  • truthfully,
  • literally,
  • square,
  • severely,
  • indeed,
  • scrupulously.
  •for sure (adverb)
  • sure thing,
  • for real,
  • no two ways about it,
  • really,
  • dead sure,
  • no doubt,
  • no question.
  •surely (adverb)
  • evidently,
  • conclusively,
  • plainly,
  • inevitably.

• n.

  •certainly (noun)
  • certainly.
  •for certain (noun)
  • sure,
  • sure as shooting,
  • surely.
  •without a doubt (noun)
  • easily.

• Other synonyms:

  •Other relevant words:
  • indubitably,
  • by all means,
  • posolutely,
  • forsooth,
  • and no mistake,
  • assuredly,
  • of course,
  • without doubt,
  • positive,
  • at any rate,
  • clearly,
  • naturally,
  • indisputably,
  • Doubtlessly,
  • definite,
  • certain,
  • for fair,
  • absotively.

Antonyms for For certain:

• adj.

  • inevitable
    later, Escapable, unlikely, avoidable, preventable, distant, fortuitous, unsure, doubtful, uncertain.
  • unmistakable
    indistinct, vague, equivocal, ambiguous, secret, dubious, Mistakable, disputable, hidden, unclear, unknown, obscure, questionable.

• adv.

  • exactly
    incompletely, indefinite, doubtfully, inaccurately, dubiously, questionably, partially, inexactly.
  • surely
    vaguely, indefinitely.