Antonyms for certain
ˈsɜr tncer·tain

WiktionaryRate these synonyms:2.3 / 3 votes

1. certainadjective

   Antonyms:
   uncertain

2. certainadjective

   Sure, positive, not doubting.

   Certain people are good at running.

   Antonyms:
   uncertain

English Synonyms and AntonymsRate these synonyms:2.0 / 1 vote

1. certain

   That is authentic which is true to the facts; that is genuine which is true to its own claims; as, authentic history; genuine money.

   A 'genuine' work is one written by the author whose name it bears; an 'authentic' work is one which relates truthfully the matters of which it treats. For example, the apocryphal Gospel of St. Thomas is neither 'genuine' nor 'authentic.' It is not 'genuine,' for St. Thomas did not write it; it is not 'authentic,' for its contents are mainly fables and lies.

   Trench On the Study of Words lect. vi, p. 189. [W. J. Widdleton]

   Authentic is, however, used by reputable writers as synonymous with genuine, tho usually where genuineness carries a certain authority. We speak of accepted conclusions, certain evidence, current money, genuine letters, a legitimate conclusion or legitimate authority, original manuscripts, real value, received interpretation, sure proof, a true statement, a trustworthy witness, a veritable discovery.

   Antonyms:
   apocryphal, baseless, counterfeit, disputed, exploded, fabulous, false, fictitious, spurious, unauthorized

   Synonyms:
   accepted, accredited, authentic, authoritative, authorized, current, genuine, legitimate, original, real, received, reliable, sure, true, trustworthy, veritable

Complete Dictionary of Synonyms and AntonymsRate these synonyms:0.0 / 0 votes

1. certain

   Antonyms:
   uncertain, dubious, exceptional, irregular, casual, occasional, questionable, doubtful, vacillating, undecided, uncertain

   Synonyms:
   true, fixed, regular, established, incontrovertible, undoubtful, indubitable, infallible, unmistakable, sure, unfailing, real, actual, undeniable, positive, convinced, assured

Princeton's WordNetRate these antonyms:2.0 / 2 votes

1. certain(a)adjective

   definite but not specified or identified

   "set aside a certain sum each week"; "to a certain degree"; "certain breeds do not make good pets"; "certain members have not paid their dues"; "a certain popular teacher"; "a certain Mrs. Jones"

   Antonyms:
   undependable, flukey, unreliable, contingent, iffy, chancy, uncertain, careless, up in the air, indefinite, fluky

2. certain(p), sureadjective

   having or feeling no doubt or uncertainty; confident and assured

   "felt certain of success"; "was sure (or certain) she had seen it"; "was very sure in his beliefs"; "sure of her friends"

   Antonyms:
   iffy, unreliable, chancy, undependable, flukey, careless, fluky, up in the air, uncertain, contingent, indefinite

3. certain(p)adjective

   established beyond doubt or question; definitely known

   "what is certain is that every effect must have a cause"; "it is certain that they were on the bus"; "his fate is certain"; "the date for the invasion is certain"

   Antonyms:
   undependable, indefinite, flukey, up in the air, chancy, uncertain, iffy, unreliable, fluky, careless, contingent

4. certain, sureadjective

   certain to occur; destined or inevitable

   "he was certain to fail"; "his fate is certain"; "In this life nothing is certain but death and taxes"- Benjamin Franklin; "he faced certain death"; "sudden but sure regret"; "he is sure to win"

   Antonyms:
   indefinite, fluky, contingent, flukey, undependable, iffy, unreliable, careless, chancy, uncertain, up in the air

   Synonyms:
   certain(p), sealed, certain(a), trusted, indisputable, sure

5. sealed, certainadjective

   established irrevocably

   "his fate is sealed"

   Antonyms:
   up in the air, indefinite, careless, unreliable, iffy, undependable, uncertain, flukey, chancy, fluky, contingent

   Synonyms:
   certain(p), sealed, sure, certain(a), plastered

6. certain, sureadjective

   reliable in operation or effect

   "a quick and certain remedy"; "a sure way to distinguish the two"; "wood dust is a sure sign of termites"

   Antonyms:
   chancy, unreliable, flukey, careless, iffy, up in the air, fluky, undependable, contingent, uncertain, indefinite

   Synonyms:
   certain(p), sealed, certain(a), trusted, indisputable, sure

7. certain, sureadjective

   exercising or taking care great enough to bring assurance

   "be certain to disconnect the iron when you are through"; "be sure to lock the doors"

   Antonyms:
   fluky, indefinite, chancy, iffy, undependable, careless, up in the air, unreliable, contingent, flukey, uncertain

   Synonyms:
   certain(p), sealed, certain(a), trusted, indisputable, sure

Synonyms, Antonyms & Associated WordsRate these synonyms:0.0 / 0 votes

1. certainadjective

   Antonyms:
   indefinite, uncertain, doubtful, uncertain

   Synonyms:
   assured, confident, convinced, satisfied, undoubting, undeniable, irrefutable, indubitable, incontrovertible, incontestable, sure, inevitable, unavoidable, unfailing, infallible, inerrable, fixed, stated, specified

Editors ContributionRate these antonyms:0.0 / 0 votes

1. doubtfully

   free from doubt or reservation; confident; sure.

   i am certain he will come.

   Submitted by JP03 on January 19, 2015  

How to use certain in a sentence?

1. Sol Orien:

   The investigation is ongoing, but we recently determined that an unauthorized individual acquired certain documents from our systems, those documents are currently under review, and we are working with a third-party technological forensic firm to determine the scope of potential data that may have been involved.

2. Paul Steele:

   There's a number of ideas about stringency or even time, where you let certain states reach a certain standard at a different time.

3. RAS CARDO REGGAE:

   its futile looking for -motives- when we already know the reasons as to why certain things happen. An exercise in futility will not a safe solution make. Most things are casually related. If a=b, and b=c, then a=c.

4. Susan Whitbourne:

   Added to this rebellious component of the behavior is the anonymity provided by social media and the disinhibition it enables, once posted, these displays will generate a certain amount of social reinforcement( i.e. likes and thumbs ups), and so the behavior spreads.

5. Oscar Wilde:

   To be good, according to the vulgar standard of goodness, is obviously quite easy. It merely requires a certain amount of sordid terror, a certain lack of imaginative thought, and a certain low passion for middle-class respectability.

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