| 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 |
| certifiable | (adjective) capable of being guaranteed or certified | - |
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| (adjective) fit to be certified as insane (and treated accordingly) | Synonyms: certified |
| certificated | (adjective) furnished with or authorized by a certificate: | - |
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| certificatory | (adjective) serving to certify or endorse authoritatively | - |
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| certified | (adjective) endorsed authoritatively as having met certain requirements | - |
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| (adjective) fit to be certified as insane (and treated accordingly) | Synonyms: certifiable |
| (adjective) holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill | Synonyms: qualified |