Certain synonyms such as "determined, accepted, assured, defined, and definite". Certain is an adjective, and its antonyms are unthinkable, doubtful, possible, unlikely, and unreliable. Here are 100 another word for certain with example sentences.
Another word for Certain
1. unquestionable
- very likely
- unquestioned
- unquestionable
- unpreventable
- unmistakable
- unfailing
- unerring
- unequivocal
- undoubted
- undisputed
- undeniable
- uncontested
- unchallenged
- unavoidable
- trustworthy
- trusted
- tried and tested
- transparent
- there are no two ways about it
- tested
- sure to happen
- sure-fire
- sure
- sovereign
- sound
- reliable
- recognized
- predictable
- predestined
- plain
- patent
- palpable
- out of one's hands
- obvious
- not in question
- not in doubt
- necessary
- nailed on
- manifest
- irrefutable
- in the bag
- infallible
- inexorable
- inevitable
- inescapable
- ineluctable
- indubitable
- indisputable
- incontrovertible
- incontestable
- guaranteed
- foolproof
- fated
- evident
- efficacious
- effective
- destined
- dependable
- definite
- confirmed
- conclusive
- clear
- bound to happen
- bound
- beyond question
- beyond doubt
- automatic
- assured of doing something
- assured
- as sure as eggs is eggs
- acknowledged
- accepted
2. sure
- unshaken in one's belief
- sure
- secure in one's belief
- satisfied
- positive
- persuaded
- not question
- in no doubt
- hold the unwavering view
- have no doubt
- easy in one's mind
- convinced
- confident
- assured
3. determined
How to Use certain in a Sentence
Certain habits are potentially harmful.
Even emotional support can make someone an abetter in certain cases.
He felt certain of victory.
I am certain about this.
Only certain activities are allowed here.
She is certain of success.
We are certain it's true.