| adjective | having or feeling no doubt or uncertainty; confident and assured “felt certain of success” |
| adjective | exercising or taking care great enough to bring assurance “be certain to disconnect the iron when you are through” |
| adjective | certain to occur; destined or inevitable; ; ; - Benjamin Franklin “he was certain to fail” |
| adjective | physically secure or dependable “a sure footing” |
| adjective | reliable in operation or effect “a quick and certain remedy” |
| adjective | (of persons) worthy of trust or confidence “a sure (or trusted) friend” |
| adjective | infallible or unfailing “a sure (or true) sign of one's commitment” |
| adjective | certain not to fail “a sure hand on the throttle” |
| adjective | impossible to doubt or dispute “indisputable (or sure) proof” |
| adverb | definitely or positively (`sure' is sometimes used informally for `surely') “the results are surely encouraging” |
| sureness | noun | freedom from doubt; belief in yourself and your abilities |
| indisputability | noun | the quality of being beyond question or dispute or doubt |