Synonyms & Antonyms of certainty
certainty
1. (Noun) the state of being certain
- He spoke with such certainty that we had no reason to doubt his words.
Synonyms
confidence
assurance
surety
sureness
positiveness
conviction
certitude
reliability
satisfaction
determination
validity
belief
trust
faith
authoritativeness
2. (Noun) something that is certain or inevitable
- It is a certainty that water boils at 100 degrees Celsius at sea level.
Synonyms
fact
reality
actuality
inevitability
inescapability
necessity
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