| certain | (adjective) established beyond doubt or question; definitely known | - |
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| (adjective) having or feeling no doubt or uncertainty; confident and assured | Synonyms: sure |
| (adjective) certain to occur; destined or inevitable | Synonyms: sure |
| (adjective) established irrevocably | Synonyms: sealed |
| (adjective) exercising or taking care great enough to bring assurance | Synonyms: sure |
| (adjective) definite but not specified or identified | - |
| (adjective) reliable in operation or effect | Synonyms: sure |
| incertain | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: uncertain, unsure |
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| uncertain | (adjective) not established beyond doubt; still undecided or unknown | - |
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| (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, unsure |
| (adjective) not certain to occur; not inevitable | - |
| (adjective) not established or confirmed | Synonyms: unsealed |
| (adjective) ambiguous (especially in the negative) | - |
| (adjective) not consistent or dependable | - |
| (adjective) subject to change | Synonyms: changeable, unsettled |