certainty
sureness
Root
- cert: sure, settled, made certain
Other words with the cert root
- ascertain: to find out or make certain
- certain: sure; not in doubt
- certificate: document that certifies something
- certification: official confirmation or credential
- certified: officially confirmed or qualified
- certify: to confirm officially as true
- certitude: complete certainty
Certainty is sureness as a thing you can claim or lose.
His certainty faded when the second experiment contradicted the first.