Synonyms of certain in English:

certain


See definition of certain

adjective

1‘I'm certain he's guilty’

SYNONYMS
sure, confident, positive, convinced, in no doubt, unshaken in one's belief, secure in one's belief, easy in one's mind, satisfied, assured, persuaded
have no doubt, not question, hold the unwavering view
ANTONYMS

doubtful

2‘it is certain that more changes are in the offing’

SYNONYMS
unquestionable, sure, definite, beyond question, not in question, not in doubt, beyond doubt, unequivocal, indubitable, undeniable, irrefutable, indisputable, incontrovertible, incontestable, obvious, patent, manifest, evident, plain, clear, transparent, palpable, unmistakable, conclusive, recognized, confirmed, accepted, acknowledged, undisputed, undoubted, unquestioned, unchallenged, uncontested
there are no two ways about it
informal as sure as eggs is eggs
ANTONYMS

unthinkable, doubtful, possible

3‘they are certain to win’

SYNONYMS
sure, very likely, bound, destined, predestined, fated, trusted, assured of doing something
British informal nailed on
ANTONYMS

unlikely

4‘Pakistan's lead of 380 runs meant certain success’

SYNONYMS
inevitable, assured, destined, predestined, fated
reliable, unavoidable, inescapable, automatic, bound to happen, sure to happen, unpreventable, inexorable, ineluctable, predictable, necessary, out of one's hands
informal in the bag

5‘there is no certain cure for this’

SYNONYMS
reliable, dependable, trustworthy, sound, foolproof, tested, tried and tested, effective, efficacious, guaranteed, sure, unfailing, infallible, unerring
informal sure-fire
dated sovereign
ANTONYMS

unreliable

6‘a certain sum of money is required’

SYNONYMS
determined, definite, fixed, established, precise, defined, exact, explicit, express
ANTONYMS

undefined

7‘a certain lady that you know’

SYNONYMS
particular, specific, individual, special, especial
ANTONYMS

nameless, undifferentiated, general

8‘to a certain extent that is true’

SYNONYMS
moderate, modest, medium, middling, unexceptional
tolerable, passable, adequate, fair, decent, acceptable
limited, small
ANTONYMS

great


Phrases

    make certain

    ‘make certain that storage and access areas are of adequate size for any power equipment used’


    SYNONYMS

    make sure, ensure, see to it

    confirm, check, verify, corroborate, establish